diff --git a/VERSION b/VERSION
index c7c3f3333e..f8f7381409 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.26.2
+1.26.3
diff --git a/bin/rvm-prompt b/bin/rvm-prompt
index fa324a0f34..56dd29668f 100755
--- a/bin/rvm-prompt
+++ b/bin/rvm-prompt
@@ -25,7 +25,7 @@ add_raw_token()
 
 rvm_gemset_separator="${rvm_gemset_separator:-"@"}"
 if
-  [[ "${GEM_HOME:-}" =~ rvm && "$ruby_string" != "$rvm_path/bin/ruby" ]]
+  [[ "${GEM_HOME:-}" == *rvm* && "$ruby_string" != "$rvm_path/bin/ruby" ]]
 then
   unset format
   while
diff --git a/bin/rvm-shell b/bin/rvm-shell
index ef8826f731..df963ee1d5 100755
--- a/bin/rvm-shell
+++ b/bin/rvm-shell
@@ -50,7 +50,7 @@ then
   rvm_shell_ruby_string="$1"
   shift
 elif
-  [[ "$1" == "--path" ]] && [[ -d "$2" || "$2" =~ /* ]]
+  [[ "$1" == "--path" ]] && [[ -d "$2" || "$2" == "/"* ]]
 then
   if
     [[ -d "$2" ]]
diff --git a/binscripts/rvm-installer b/binscripts/rvm-installer
index 4981f3e94c..beba8741d0 100755
--- a/binscripts/rvm-installer
+++ b/binscripts/rvm-installer
@@ -81,7 +81,7 @@ rvm_install_commands_setup()
     fail "Could not find GNU compatible version of 'tar' command, make sure it's available first before continuing installation."
   fi
   if
-    [[ ! " ${rvm_tar_options:-} " =~ " --no-same-owner "  ]] &&
+    [[ " ${rvm_tar_options:-} " != *" --no-same-owner "*  ]] &&
     $rvm_tar_command --help 2>&1 | GREP_OPTIONS="" \grep -- --no-same-owner >/dev/null
   then
     rvm_tar_options="${rvm_tar_options:-}${rvm_tar_options:+ }--no-same-owner"
@@ -180,10 +180,10 @@ __rvm_curl_output_control()
   then
     __flags+=( "--silent" "--show-error" )
   elif
-    [[ " $*" =~ " -s" || " $*" =~ " --silent" ]]
+    [[ " $*" == *" -s"* || " $*" == *" --silent"* ]]
   then
     # make sure --show-error is used with --silent
-    [[ " $*" =~ " -S" || " $*" =~ " -sS" || " $*" =~ " --show-error" ]] ||
+    [[ " $*" == *" -S"* || " $*" == *" -sS"* || " $*" == *" --show-error"* ]] ||
     {
       __flags+=( "--show-error" )
     }
@@ -481,7 +481,7 @@ rvm_install_default_settings()
 {
   # Tracing, if asked for.
   if
-    [[ "$*" =~ --trace ]] || (( ${rvm_trace_flag:-0} > 0 ))
+    [[ "$*" == *--trace* ]] || (( ${rvm_trace_flag:-0} > 0 ))
   then
     set -o xtrace
     rvm_trace_flag=1
@@ -772,7 +772,7 @@ follow this link for details how to fix:
     ;;
   esac
 
-  if [[ "$rvm_path" != /* ]]
+  if [[ "$rvm_path" != "/"* ]]
   then fail "The rvm install path must be fully qualified. Tried $rvm_path"
   fi
 }
@@ -860,7 +860,7 @@ rvm_install_ruby_and_gems()
 "
 
     if
-      [[ "${install_gems[*]}" =~ "rails" ]]
+      [[ "${install_gems[*]}" == *"rails"* ]]
     then
       printf "%b" "
   * To start using rails you need to run \`rails new <project_dir>\`.
diff --git a/binscripts/rvm-installer.asc b/binscripts/rvm-installer.asc
index ba50e80bf1..d7643df383 100644
--- a/binscripts/rvm-installer.asc
+++ b/binscripts/rvm-installer.asc
@@ -1,17 +1,17 @@
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2
 
-iQIcBAABAgAGBQJUXmL3AAoJEOIGwp+/BP8XZYAQAIFDRTMUww09VHS1rhbq9hHU
-TDunUCrxMXsnNOmT4LMW+aTx8X3uXQDvj4HNd5rqTJaO9VvTAnDqYFwegGPTwQKP
-4RR8SmyAROqw64A219kYtuaqxQgNeOvVBCtXsSGylsJlh5/RC7QXjjoPdECckSA8
-KnkJp0AQZYJrruHbjFqiQh6hmpmnWCox762VxwsiAXms/8XU+UGkA+WJPfslrPkS
-OXGnJOsfX6MA6sRV0258hwEq4nh44Tp3zkL7D2b/YEoUvmEzQ9lqqtFnBGaatn1a
-ktyeRaLaZCjqhvYaajgWvamD3/yxdlKcvISJIchwzqxX3GoTKxuAjrdfnXHUGI6A
-QF/wadnWDZ7eNStOYRr7mkIB9l8Y7KllMZRYM36q5cGvjS3ec7x+9fGERMCsZLDw
-O7GjwGz14RICfjCCbtLK8BOvBW53k7kHBsmY+WT+A/4C9cM0KSUvwTP20dH2Cg5m
-cbDph7MaK6ecdCK72Ref+JZzT2rV230L5a4KSehir2Yd+dI3drGRE2yVD0nL0Dhn
-g+RgTHXyK2ZmRDt2i6IcxHKzv1nCEjO76nTg3+SqBtvxsey9r0y/g1p4Xn/X7lkT
-zoLAMO9LMqWZ33ZeOKA1rPG1PYxusR5jmIQaY8159ZHEzuTVA5hbygi5HfRVZyew
-GtUxTqrMsFcbyz2v2663
-=TAQ2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+=kGgR
 -----END PGP SIGNATURE-----
diff --git a/help/gemset/copy.md b/help/gemset/copy.md
new file mode 100644
index 0000000000..350d4287fa
--- /dev/null
+++ b/help/gemset/copy.md
@@ -0,0 +1,9 @@
+
+## Usage
+
+    rvm gemset copy ruby-from[@gemset] ruby-to[@gemset]
+
+
+## Description
+
+Copy the `ruby-from` `gemset`s gems (`default` if omitted) to the `ruby-to` `gemset`.
diff --git a/rvm-test-rvm1/exports_comment_test.sh b/rvm-test-rvm1/exports_comment_test.sh
new file mode 100644
index 0000000000..d99d1d4c28
--- /dev/null
+++ b/rvm-test-rvm1/exports_comment_test.sh
@@ -0,0 +1,9 @@
+source "$rvm_path/scripts/rvm"
+
+export TEST_VAR=2     # env[TEST_VAR]=/^2$/; env[rvm_old_TEST_VAR]=/^$/
+rvm export TEST_VAR=3 # env[TEST_VAR]=/^3$/; env[rvm_old_TEST_VAR]=/^2$/
+rvm unexport          # env[TEST_VAR]=/^2$/; env[rvm_old_TEST_VAR]=/^$/
+
+unset TEST_VAR        # env[TEST_VAR]=/^$/
+rvm export TEST_VAR=3 # env[TEST_VAR]=/^3$/
+rvm unexport          # env[TEST_VAR]=/^$/
diff --git a/scripts/base b/scripts/base
index 337ad0cb47..6530674936 100755
--- a/scripts/base
+++ b/scripts/base
@@ -5,12 +5,20 @@
 #duplicated from scripts/rvm - rare reload issue
 __rvm_has_opt()
 {
-  # pre-gnu
-  if [[ -n "${ZSH_VERSION}"  ]] && setopt | GREP_OPTIONS="" \command \grep "^${1}$" >/dev/null 2>&1
-  then return 0
-  elif [[ -n "${BASH_VERSION}" ]] && [[ ":$SHELLOPTS:" =~ ":${1}:" ]]
-  then return 0
-  else return 1
+  if # pre-gnu
+   [[ -n "${ZSH_VERSION}"  ]]
+  then
+    setopt | GREP_OPTIONS="" \command \grep "^${1}$" >/dev/null 2>&1 || return $?
+  elif # mksh
+    [[ -n "${KSH_VERSION}"  ]]
+  then
+    set +o | GREP_OPTIONS="" \command \grep "-o ${1}$" >/dev/null 2>&1 || return $?
+  elif # bash
+    [[ -n "${BASH_VERSION}" ]]
+  then
+    [[ ":$SHELLOPTS:" == *":${1}:"* ]] || return $?
+  else # what is this?!
+    return 1
   fi
 }
 
diff --git a/scripts/cd b/scripts/cd
index 2480d0f75d..ad01e66afa 100755
--- a/scripts/cd
+++ b/scripts/cd
@@ -35,7 +35,6 @@ case "${rvm_project_rvmrc:-1}" in
     __rvm_do_with_env_after
     return 0
   }
-  export -a chpwd_functions
   [[ " ${chpwd_functions[*]} " == *" __rvm_cd_functions_set "* ]] ||
   chpwd_functions=( "${chpwd_functions[@]}" __rvm_cd_functions_set )
 
diff --git a/scripts/cli b/scripts/cli
index 31ecbdcfee..aed3774ef1 100755
--- a/scripts/cli
+++ b/scripts/cli
@@ -31,7 +31,6 @@ __rvm_parse_args_find_known_flags()
         rvm_disable_binary_flag=1
         ;;
       (--patches|--patch)
-        export -a rvm_patch_names
         __rvm_custom_separated_array rvm_patch_names , "${2:-}"
         rvm_patch_original_pwd="$PWD"
         rvm_disable_binary_flag=1
@@ -77,7 +76,7 @@ __rvm_parse_args()
   rvm_parse_break=0
 
   if
-    [[ " $* " =~ " --trace " ]]
+    [[ " $* " == *" --trace "* ]]
   then
     echo "$@"
     __rvm_version
@@ -236,9 +235,9 @@ __rvm_parse_args()
               [[ -n "${next_token:-}" ]] &&
               [[ -x "${next_token:-}" ||
                 -d "${next_token:-}" ||
-                "${next_token:-}" =~ ^http ||
-                "${next_token:-}" =~ tar.bz2$ ||
-                "${next_token:-}" =~ tar.gz$
+                "${next_token:-}" == http* ||
+                "${next_token:-}" == *tar.bz2 ||
+                "${next_token:-}" == *tar.gz
               ]]
             do
               rvm_ruby_args=("$next_token" "${rvm_ruby_args[@]}")
@@ -286,7 +285,9 @@ __rvm_parse_args()
             if
               [[ -n "$next_token" ]]
             then
-              rvm_export_args="$next_token$@"
+              typeset -a ___args
+              ___args=( "$next_token" "$@" )
+              rvm_export_args="${___args[*]}"
               rvm_action="export"
               rvm_parse_break=1
             else
@@ -482,10 +483,10 @@ __rvm_parse_args()
             fi
             while
               [[ -n "${next_token:-}" ]] &&
-              [[ "${next_token:-}" =~ ^http ||
-                "${next_token:-}" =~ tar.bz2$ ||
-                "${next_token:-}" =~ tar.gz$ ||
-                "${next_token:-}" =~ ":"
+              [[ "${next_token:-}" == http* ||
+                "${next_token:-}" == *tar.bz2 ||
+                "${next_token:-}" == *tar.gz ||
+                "${next_token:-}" == *":"*
               ]]
             do
               rvm_ruby_args=("${rvm_ruby_args[@]}" "$next_token")
@@ -508,7 +509,6 @@ __rvm_parse_args()
             ;;
 
           --patches|--patch)
-            export -a rvm_patch_names
             __rvm_custom_separated_array rvm_patch_names , "$next_token"
             next_token="${1:-}"
             (( $# == 0 )) || shift
@@ -815,7 +815,6 @@ __rvm_parse_args()
 rvm()
 {
   typeset result current_result
-  export -a rvm_ruby_args >/dev/null 2>/dev/null
   rvm_ruby_args=()
 
   __rvm_teardown_if_broken
@@ -971,7 +970,7 @@ rvm()
           fi
           unset gem_prefix
         elif
-          [[ "${rvm_ruby_args[*]}" =~ ^rename ]]
+          [[ "${rvm_ruby_args[*]}" == rename* ]]
         then
           typeset _command _from _to
           read _command _from _to <<<"${rvm_ruby_args[*]}"
diff --git a/scripts/completion b/scripts/completion
index 79de35d5b2..d31cc64076 100755
--- a/scripts/completion
+++ b/scripts/completion
@@ -5,7 +5,7 @@ if
   [[ -n "${ZSH_VERSION:-}" ]]
 then
   # zsh completion for Ruby Version Manager (RVM), thanks to https://github.com/JoeKun
-  [[ " ${fpath[*]} " =~ " ${rvm_scripts_path:-$rvm_path/scripts}/extras/completion.zsh " ]] ||
+  [[ " ${fpath[*]} " == *" ${rvm_scripts_path:-$rvm_path/scripts}/extras/completion.zsh "* ]] ||
   {
     fpath+=( "${rvm_scripts_path:-$rvm_path/scripts}/extras/completion.zsh" )
     if
diff --git a/scripts/fetch b/scripts/fetch
index a9aed555f1..6c95e26eb4 100755
--- a/scripts/fetch
+++ b/scripts/fetch
@@ -135,7 +135,7 @@ then
     __fallbacks=()
     __default_ruby_url="$(__rvm_db ruby_url)"
     if
-      [[ "${url}" =~ "${__default_ruby_url}" ]]
+      [[ "${url}" == "${__default_ruby_url}"* ]]
     then
       __iterator=1
       while
@@ -146,11 +146,11 @@ then
         : $(( __iterator+=1 ))
       done
     elif
-      [[ "${url}" =~ "http://" ]]
+      [[ "${url}" == "http://"* ]]
     then
       __fallbacks+=( "${url/http:/ftp:}"  "${url/http:\/\//http://www.mirrorservice.org/sites/}"  )
     elif
-      [[ "${url}" =~ "https://" ]]
+      [[ "${url}" == "https://"* ]]
     then
       __fallbacks+=( "${url/https:/ftp:}" "${url/https:\/\//http://www.mirrorservice.org/sites/}" )
     else
diff --git a/scripts/functions/build b/scripts/functions/build
index cd925ff983..0095384517 100644
--- a/scripts/functions/build
+++ b/scripts/functions/build
@@ -16,7 +16,7 @@ __rvm_selected_compiler()
 {
   #TODO: add handling for rvm_configure_env
   if
-    [[ " ${rvm_configure_flags[*]}" =~ " --with-gcc=" ]]
+    [[ " ${rvm_configure_flags[*]}" == *" --with-gcc="* ]]
   then
     typeset __compiler
     for __compiler in "${rvm_configure_flags[@]}"
diff --git a/scripts/functions/build_config b/scripts/functions/build_config
index b478aaeada..8fb691f592 100755
--- a/scripts/functions/build_config
+++ b/scripts/functions/build_config
@@ -364,7 +364,7 @@ __rvm_setup_compile_environment_flags_threads()
       if [[ "${_system_name}" == "FreeBSD" || "${_system_name}" == "DragonFly" ]]
       then rvm_make_flags+=( -B )
       fi
-      if [[ " ${rvm_make_flags[*]}" =~ " -j" ]]
+      if [[ " ${rvm_make_flags[*]}" == *" -j"* ]]
       then rvm_warn "Found user configured '-j' flag in 'rvm_make_flags', please note that RVM can detect number of CPU threads and set the '-j' flag automatically if you do not set it."
       else rvm_make_flags+=( -j$(__rvm_detect_max_threads) )
       fi
diff --git a/scripts/functions/build_config_system b/scripts/functions/build_config_system
index 9bdcf3365a..77eed8d3fb 100644
--- a/scripts/functions/build_config_system
+++ b/scripts/functions/build_config_system
@@ -69,7 +69,7 @@ __rvm_setup_compile_environment_system_early_OSX()
 
 __rvm_setup_compile_environment_system_SmartOS()
 {
-  [[ "${_system_version}" =~ ^joyent ]] || return 0
+  [[ "${_system_name}" == "SmartOS" ]] || return 0
 
   if __rvm_string_match "$1" "ruby-2.0.*"; then
     __rvm_update_configure_env CFLAGS="-R -fPIC"
diff --git a/scripts/functions/build_requirements_helpers b/scripts/functions/build_requirements_helpers
index 995a45ecbc..7067fb76e1 100644
--- a/scripts/functions/build_requirements_helpers
+++ b/scripts/functions/build_requirements_helpers
@@ -49,7 +49,7 @@ __rvm_filter_installed_package_from_missing()
   typeset __package
   for __package
   do
-    [[ " ${packages_missing[*]} " =~ " ${__package} " ]] || __rvm_add_once packages_installed "${__package}"
+    [[ " ${packages_missing[*]} " == *" ${__package} "* ]] || __rvm_add_once packages_installed "${__package}"
   done
   case "$rvm_autolibs_flag_number" in
     (0|1|2) # just ignore
@@ -123,7 +123,7 @@ requirements_detect_installed()
 
 requirements_version_minimal()
 {
-  if [[ " ${packages_to_install[*]} " =~ " $1 " ]]
+  if [[ " ${packages_to_install[*]} " == *" $1 "* ]]
   then return 0
   fi
   typeset latest_version="$(
diff --git a/scripts/functions/cli b/scripts/functions/cli
index 05bc937e89..7b624fb852 100644
--- a/scripts/functions/cli
+++ b/scripts/functions/cli
@@ -284,7 +284,7 @@ if your intention was ruby installation use instead: rvm install $1
   esac
   case "$1" in
     (stable|master|head|branch|latest|latest-*|[0-9]*.[0-9]*.[0-9]*)
-      __rvm_cli_get_and_execute_installer || return $?
+      __rvm_cli_get_and_execute_installer "$@" || return $?
 
       typeset -x rvm_hook
       rvm_hook="after_update"
diff --git a/scripts/functions/env b/scripts/functions/env
index 00ada525e9..348fc2590c 100644
--- a/scripts/functions/env
+++ b/scripts/functions/env
@@ -91,8 +91,14 @@ __rvm_export()
 __rvm_unset_exports()
 {
   typeset wrap_name name value
-  while IFS== read -d "" wrap_name value
+  typeset -a __variables_list
+  __rvm_read_lines __variables_list <<<"$(
+    printenv | __rvm_sed '/=/ { s/=.*$//; p; }; d;'
+  )"
+
+  for wrap_name in "${__variables_list[@]}"
   do
+    eval "value=\"\${${wrap_name}}\""
     case "$wrap_name" in
       rvm_old_*)
         name=${wrap_name#rvm_old_}
@@ -103,7 +109,7 @@ __rvm_unset_exports()
         unset $wrap_name
         ;;
     esac
-  done < <(printenv_null)
+  done
 }
 
 __rvm_fix_path_from_gem_path()
@@ -210,26 +216,26 @@ __rvm_unload()
   fi
 
   # aliases
-  __rvm_unload_action unalias  <(
+  __rvm_unload_action unalias <<<"$(
     if [[ -n "${ZSH_VERSION:-}" ]]
     then alias | __rvm_awk -F"=" '/rvm/ {print $1}'
     else alias | __rvm_awk -F"[= ]" '/rvm/ {print $2}'
     fi
-  )
+  )"
 
   # variables
-  __rvm_unload_action unset <(
+  __rvm_unload_action unset <<<"$(
     set |
       __rvm_awk -F"=" 'BEGIN{v=0;} /^[a-zA-Z_][a-zA-Z0-9_]*=/{v=1;} v==1&&$2~/^['\''\$]/{v=2;}
         v==1&&$2~/^\(/{v=3;} v==2&&/'\''$/&&!/'\'\''$/{v=1;} v==3&&/\)$/{v=1;} v{print;} v==1{v=0;}' |
       __rvm_awk -F"=" '/^[^ ]*(RUBY|GEM|IRB|gem|rubies|rvm)[^ ]*=/ {print $1} /^[^ ]*=.*rvm/ {print $1}' |
       __rvm_grep -vE "^PROMPT|^prompt|^PS|^BASH_SOURCE"
-  )
+  )"
 
   # functions
-  __rvm_unload_action __function_unset <(
+  __rvm_unload_action __function_unset <<<"$(
     typeset -f | __rvm_awk '$2=="()" {fun=$1} /rvm/{print fun}' | sort -u | __rvm_grep -v __rvm_unload_action
-  )
+  )"
   if
     [[ -n "${ZSH_VERSION:-}" ]]
   then
@@ -268,11 +274,11 @@ __rvm_env_print()
   environment_file_path="$rvm_environments_path/$(__rvm_env_string)"
   # Echo the path or environment file.
   if
-    [[ "$rvm_path_flag" == "1" || "$*" =~ "--path" ]]
+    [[ "$rvm_path_flag" == "1" || "$*" == *"--path"* ]]
   then
     echo "$environment_file_path"
   elif
-    [[ "$rvm_cron_flag" == "1" || "$*" =~ "--cron" ]]
+    [[ "$rvm_cron_flag" == "1" || "$*" == *"--cron"* ]]
   then
     \command \cat "$environment_file_path" |
       __rvm_grep -Eo "[^ ]+=[^;]+" |
diff --git a/scripts/functions/environment b/scripts/functions/environment
index f2d91f101f..86fe2e49c8 100644
--- a/scripts/functions/environment
+++ b/scripts/functions/environment
@@ -174,8 +174,8 @@ __variables_definition()
   )
 
   case "${__method}" in
-    (export) export -a "${__array_list[@]}" || true ;;
-    (unset)  unset     "${__array_list[@]}" || true ;;
+    (export) true ;;
+    (unset)  unset "${__array_list[@]}" || true ;;
     (*)
       rvm_error "Unknown action given to __variables_definition: ${__method}"
       return 1
diff --git a/scripts/functions/gemset b/scripts/functions/gemset
index af799b5263..72f54eb81c 100644
--- a/scripts/functions/gemset
+++ b/scripts/functions/gemset
@@ -464,10 +464,10 @@ gemset_pristine()
       printf "%b" "${_gem}-${_version} "
       "${_pristine_command[@]}" "${_gem}" --version "${_version}" >/dev/null ||
         _failed+=(  "${_gem} --version ${_version}" )
-    done < <(
+    done <<<"$(
       GEM_PATH="$GEM_HOME" __rvm_list_gems \
         "${pristine_gems_filter:-"! gem.executables.empty? || ! gem.extensions.empty?"}"
-    )
+    )"
     if
       (( ${#_failed[@]} > 0 ))
     then
diff --git a/scripts/functions/hooks/jruby b/scripts/functions/hooks/jruby
index 5b8aca6a10..5807a95737 100644
--- a/scripts/functions/hooks/jruby
+++ b/scripts/functions/hooks/jruby
@@ -25,7 +25,8 @@ jruby_options_append()
 {
   for param in "$@"
   do
-    if ! [[ " ${JRUBY_OPTS} " =~ " $param " ]]
+    if
+      [[ " ${JRUBY_OPTS} " != *" $param "* ]]
     then
       JRUBY_OPTS="${JRUBY_OPTS} $param"
     fi
@@ -38,7 +39,8 @@ jruby_options_remove()
   JRUBY_OPTS=" ${JRUBY_OPTS} "
   for param in "$@"
   do
-    if [[ "${JRUBY_OPTS}" =~ " $param " ]]
+    if
+      [[ "${JRUBY_OPTS}" == *" $param "* ]]
     then
       JRUBY_OPTS="${JRUBY_OPTS// $param / }"
     fi
diff --git a/scripts/functions/hooks/rbx b/scripts/functions/hooks/rbx
index 88fb16a3b5..17ce256d2f 100644
--- a/scripts/functions/hooks/rbx
+++ b/scripts/functions/hooks/rbx
@@ -12,7 +12,7 @@ rbx_options_append()
 {
   for param in "$@"
   do
-    if ! [[ " ${RBXOPT} " =~ " $param " ]]
+    if [[ " ${RBXOPT} " != *" $param "* ]]
     then
       RBXOPT="${RBXOPT} $param"
     fi
@@ -25,7 +25,7 @@ rbx_options_remove()
   RBXOPT=" ${RBXOPT} "
   for param in "$@"
   do
-    if [[ "${RBXOPT}" =~ " $param " ]]
+    if [[ "${RBXOPT}" == *" $param "* ]]
     then
       RBXOPT="${RBXOPT// $param / }"
     fi
diff --git a/scripts/functions/installer b/scripts/functions/installer
index 293506a9de..03356df105 100644
--- a/scripts/functions/installer
+++ b/scripts/functions/installer
@@ -1041,13 +1041,14 @@ setup_user_profile_check()
 setup_user_profile_detect()
 {
   etc_profile_file="/etc/profile.d/rvm.sh"
+  search_list_mksh=( "$HOME/.mkshrc" "$HOME/.profile" )
   search_list_bash=( "$HOME/.bashrc" "$HOME/.bash_profile" "$HOME/.bash_login" )
   search_list_zsh=( "${ZDOTDIR:-${HOME}}/.zshenv" "${ZDOTDIR:-${HOME}}/.zprofile" "${ZDOTDIR:-${HOME}}/.zshrc" "${ZDOTDIR:-${HOME}}/.zlogin" )
-  search_list=( "$HOME/.profile" "${search_list_bash[@]}" "${search_list_zsh[@]}" )
+  search_list=( "${search_list_mksh[@]}" "${search_list_bash[@]}" "${search_list_zsh[@]}" )
 
   target_rc=( "$HOME/.profile" "$HOME/.bashrc" "${ZDOTDIR:-${HOME}}/.zshrc" )
 
-  target_login=()
+  target_login=( "$HOME/.profile" )
   pick_a_file target_login "$HOME/.bash_profile" "$HOME/.bash_login"
   target_login+=( "${ZDOTDIR:-${HOME}}/.zlogin" )
 
@@ -1123,10 +1124,8 @@ setup_user_profile_rc()
 export PATH=\"\$PATH:$local_rvm_path/bin\" # Add RVM to PATH for scripting
 " >> "$profile_file"
     done
-    user_rc_files=( "${target_rc[@]}" )
   else
     setup_user_profile_summary found_rc "PATH"
-    user_rc_files=( "${found_rc[@]}" )
   fi
 }
 
@@ -1165,10 +1164,8 @@ setup_user_profile_login()
 [[ -s \"$local_rvm_path/scripts/rvm\" ]] && source \"$local_rvm_path/scripts/rvm\" # Load RVM into a shell session *as a function*
 " >> "$profile_file"
     done
-    user_login_files=( "${target_login[@]}" )
   else
     setup_user_profile_summary found_login "sourcing"
-    user_login_files=( "${found_login[@]}" )
   fi
 }
 
@@ -1177,8 +1174,7 @@ setup_user_profile()
   setup_user_profile_check || return 0
 
   export user_profile_file
-  export -a user_login_files user_rc_files
-  typeset -a search_list search_list_bash search_list_zsh
+  typeset -a search_list search_list_mksh search_list_bash search_list_zsh
   typeset -a target_rc target_login found_rc found_login
   typeset etc_profile_file profile_file local_rvm_path local_rvm_path_sed
   local_rvm_path="${rvm_path/#$HOME/\$HOME}"
diff --git a/scripts/functions/manage/base_install b/scripts/functions/manage/base_install
index 74df2eaba8..0be6d0ad35 100644
--- a/scripts/functions/manage/base_install
+++ b/scripts/functions/manage/base_install
@@ -417,7 +417,6 @@ https://rvm.io/rubies/named/
       ;;
   esac
 
-  export -a rvm_configure_env
   [[ -n "${rvm_configure_env[*]}" ]] || rvm_configure_env=() # zsh can assume empty var => ( '' )
 
   source "$rvm_scripts_path/functions/manage/${ruby_install_type}"
diff --git a/scripts/functions/manage/ree b/scripts/functions/manage/ree
index a76f603356..b1c035be51 100755
--- a/scripts/functions/manage/ree
+++ b/scripts/functions/manage/ree
@@ -74,7 +74,7 @@ ree_install()
     if
       [[ "Darwin" == "${_system_type}" ]] &&
       [[ "1.8.6" == "$rvm_ruby_version" || "1.8.7" == "$rvm_ruby_version" ]] &&
-      [[ ! " ${rvm_ree_options[*]} " =~ " --no-tcmalloc " ]]
+      [[ " ${rvm_ree_options[*]} " != *" --no-tcmalloc "* ]]
     then
       rvm_ree_options+=( --no-tcmalloc )
     fi
diff --git a/scripts/functions/manage/ruby b/scripts/functions/manage/ruby
index de106f894f..00d0e1b190 100644
--- a/scripts/functions/manage/ruby
+++ b/scripts/functions/manage/ruby
@@ -39,7 +39,7 @@ ruby_install()
 
   # TODO: needed on some 1.9.3, confirm with http://bugs.ruby-lang.org/issues/6903
   if
-    [[ " ${rvm_configure_flags[*]}" =~ " --enable-load-relative" ]]
+    [[ " ${rvm_configure_flags[*]}" == *" --enable-load-relative"* ]]
   then
     case ${rvm_ruby_string} in
       ruby-1.9.3-p125|ruby-1.9.3-p286|ruby-1.9.3-p327|ruby-1.9.3-p362|ruby-1.9.3-p374|ruby-1.9.3-p385)
@@ -105,7 +105,7 @@ ${_memo}"
 ${_memo}"
     fi
   elif
-    [[ ! "${rvm_ruby_string}" =~ "${_version}" ]] && (( patches_count > 0 ))
+    [[ "${rvm_ruby_string}" != *"${_version}"* ]] && (( patches_count > 0 ))
   then
     rvm_warn "Please be aware that you just installed a ruby that requires ${patches_count} patches just to be compiled on an up to date linux system.
 This may have known and unaccounted for security vulnerabilities.
diff --git a/scripts/functions/requirements/centos b/scripts/functions/requirements/centos
index ee0ab8a601..ed596c890f 100644
--- a/scripts/functions/requirements/centos
+++ b/scripts/functions/requirements/centos
@@ -48,7 +48,7 @@ or there was problem checking if libyaml-devel is available / installed."
 
 requirements_centos_update_system_check_epel()
 {
-  [[ " ${packages_to_install[*]} " =~ " libyaml-devel " ]] || return 0
+  [[ " ${packages_to_install[*]} " == *" libyaml-devel "* ]] || return 0
   [[ "${_system_name} ${_system_version}" != "RedHat 7" ]] || return 0
   # if you change this, change the scripts/functions/pkg version too
   [[ -f /etc/yum.repos.d/epel.repo ]] ||
diff --git a/scripts/functions/requirements/netbsd b/scripts/functions/requirements/netbsd
index 5c56ba7a5e..888034443c 100644
--- a/scripts/functions/requirements/netbsd
+++ b/scripts/functions/requirements/netbsd
@@ -29,7 +29,7 @@ requirements_netbsd_check_custom()
   typeset _lib
   for _lib in "$@"
   do
-    [[ " ${packages_custom[*]} " =~ " ${_lib} " ]] ||
+    [[ " ${packages_custom[*]} " == *" ${_lib} "* ]] ||
     requirements_netbsd_custom_lib_installed "${_lib}" ||
     __rvm_add_once packages_custom "${_lib}"
   done
diff --git a/scripts/functions/requirements/openindiana b/scripts/functions/requirements/openindiana
index b299028afe..ef6f48e23b 100644
--- a/scripts/functions/requirements/openindiana
+++ b/scripts/functions/requirements/openindiana
@@ -43,7 +43,7 @@ requirements_openindiana_check_custom()
 {
   for lib in "$@"
   do
-    [[ " ${packages_custom[*]} " =~ " $lib " ]] ||
+    [[ " ${packages_custom[*]} " == *" $lib "* ]] ||
     requirements_openindiana_custom_lib_installed "$lib" || __rvm_add_once packages_custom "$lib"
   done
   unset lib
diff --git a/scripts/functions/requirements/osx_brew b/scripts/functions/requirements/osx_brew
index b80815fbb1..a43154178b 100644
--- a/scripts/functions/requirements/osx_brew
+++ b/scripts/functions/requirements/osx_brew
@@ -112,7 +112,7 @@ requirements_osx_brew_libs_try_upgrade()
 requirements_osx_brew_libs_default_check_gcc42()
 {
   if
-    [[ " ${brew_libs[*]}" =~ "apple-gcc42" ]] && ! __rvm_which gcc-4.2 >/dev/null
+    [[ " ${brew_libs[*]}" == *"apple-gcc42"* ]] && ! __rvm_which gcc-4.2 >/dev/null
   then
     rvm_error "
 apple-gcc42 is not available in PATH, try:
@@ -479,7 +479,6 @@ requirements_osx_brew_ensure_brew_can_install()
 
 requirements_osx_brew_before()
 {
-  typeset -ax brew_libs brew_libs_conf
   requirements_osx_brew_ensure_brew_available   || return $?
   requirements_osx_brew_ensure_brew_can_install || return $?
 }
diff --git a/scripts/functions/requirements/osx_fink b/scripts/functions/requirements/osx_fink
index dc7c4933a7..6bb7bd37c7 100644
--- a/scripts/functions/requirements/osx_fink
+++ b/scripts/functions/requirements/osx_fink
@@ -101,7 +101,7 @@ requirements_osx_fink_libs_default_tools()
 
   if
     ! __ruby_clang_ok "$1" &&
-    [[ -z "${selected_compiler}" || "${selected_compiler}" =~ "gcc-4.2" ]]
+    [[ -z "${selected_compiler}" || "${selected_compiler}" == *"gcc-4.2"* ]]
   then
     # install gcc only if no gcc-4.2 available, prevents problems with gcc-4.2 on OSX 10.6
     __rvm_which gcc-4.2 >/dev/null || requirements_osx_fink_gcc_version_detect
diff --git a/scripts/functions/requirements/osx_port b/scripts/functions/requirements/osx_port
index 030e6a20ff..36d77945b9 100644
--- a/scripts/functions/requirements/osx_port
+++ b/scripts/functions/requirements/osx_port
@@ -53,8 +53,6 @@ requirements_osx_port_libs_install()
 requirements_osx_port_before()
 {
   requirements_osx_port_ensure_port_available || return $?
-
-  typeset -ax port_libs
 }
 
 requirements_osx_port_libs_default()
diff --git a/scripts/functions/requirements/pclinuxos b/scripts/functions/requirements/pclinuxos
index 4fad857bd2..5bafe6f657 100644
--- a/scripts/functions/requirements/pclinuxos
+++ b/scripts/functions/requirements/pclinuxos
@@ -45,7 +45,7 @@ or there was problem checking if libyaml-devel is available / installed."
 # not sure if this one is needed for pclinuxos, copied from centos
 requirements_pclinuxos_update_system_check_epel()
 {
-  [[ " ${packages_to_install[*]} " =~ " libyaml-devel " ]] || return 0
+  [[ " ${packages_to_install[*]} " == *" libyaml-devel "* ]] || return 0
   # if you change this, change the scripts/functions/pkg version too
   [[ -f /etc/synaptic.repos.d/epel.repo ]] ||
   requirements_pclinuxos_lib_installed libyaml-devel ||
diff --git a/scripts/functions/requirements/smf b/scripts/functions/requirements/smf
index ec7dcee3bd..f0ae57f8c6 100644
--- a/scripts/functions/requirements/smf
+++ b/scripts/functions/requirements/smf
@@ -195,7 +195,6 @@ requirements_smf_find_sm()
 
 requirements_smf_before()
 {
-  export -a required_extension_sets
   required_extension_sets=()
   requirements_smf_ensure_smf_available || return $?
   requirements_smf_find_sm              || return $?
diff --git a/scripts/functions/requirements/solaris b/scripts/functions/requirements/solaris
index 2100a9230c..1d7034e97c 100644
--- a/scripts/functions/requirements/solaris
+++ b/scripts/functions/requirements/solaris
@@ -50,7 +50,7 @@ requirements_solaris_check_custom()
 {
   for lib in "$@"
   do
-    [[ " ${packages_custom[*]} " =~ " $lib " ]] ||
+    [[ " ${packages_custom[*]} " == *" $lib "* ]] ||
     requirements_solaris_custom_lib_installed "$lib" || __rvm_add_once packages_custom "$lib"
   done
   unset lib
diff --git a/scripts/functions/rvmrc_project b/scripts/functions/rvmrc_project
index 92108a926a..1b8b7daf5b 100644
--- a/scripts/functions/rvmrc_project
+++ b/scripts/functions/rvmrc_project
@@ -118,7 +118,7 @@ __rvm_load_project_config()
         fi
         if   [[ -z "${__gem_names:-}" ]]
         then __gem_names=bundler
-        elif [[ ! ",${__gem_names:-}," =~ ",bundler," ]]
+        elif [[ ",${__gem_names:-}," != *",bundler,"* ]]
         then __gem_names="${__gem_names:-},bundler"
         fi
       fi
@@ -130,7 +130,7 @@ __rvm_load_project_config()
 
       rvm_ruby_string="$( \command \tr -d '\r' <"$1" | __rvm_sed -n '/^#ruby=/ {s/#ruby=//;p;}' | tail -n 1 )"
       [[ -n "${rvm_ruby_string}" ]] || {
-        rvm_ruby_string="$( \command \tr -d '\r' <"$1" | __rvm_sed -n "s/ rescue nil$//; /^\s*ruby/ {s/^\s*ruby//; s/[ ()'\"]//g; p;}" | tail -n 1 )"
+        rvm_ruby_string="$( \command \tr -d '\r' <"$1" | __rvm_sed -n "s/ rescue nil$//; /^\s*ruby[(\t ]/ {s/^\s*ruby//; s/[\t ()'\"]//g; p;}" | tail -n 1 )"
         [[ -n "${rvm_ruby_string}" ]] || return 2
       } #'
       rvm_ruby_string="${rvm_ruby_string/,:patchlevel=>/-p}"
@@ -295,7 +295,6 @@ __rvm_project_ruby_env_load_set_env()
 __rvm_project_ruby_env_load()
 {
   typeset -a __variables
-  export -a rvm_saved_env
   __rvm_project_ruby_env_check_unload
   __rvm_project_ruby_env_load_parse_file "$@"
   __rvm_project_ruby_env_load_set_env "rvm_saved_env" "${__variables[@]}"
diff --git a/scripts/functions/rvmrc_set b/scripts/functions/rvmrc_set
index 539561a019..3aba3df69e 100644
--- a/scripts/functions/rvmrc_set
+++ b/scripts/functions/rvmrc_set
@@ -124,7 +124,7 @@ then
   done
   unset __hook
 " >> .rvmrc
-    if [[ " $flags " =~ " use " ]]
+    if [[ " $flags " == *" use "* ]]
     then printf "%b" "  if (( \${rvm_use_flag:=1} >= 1 )) # display automatically"    >> .rvmrc
     else printf "%b" "  if (( \${rvm_use_flag:=1} >= 2 )) # display only when forced" >> .rvmrc
     fi
diff --git a/scripts/functions/selector b/scripts/functions/selector
index 65068c8c05..4f3e8fe110 100755
--- a/scripts/functions/selector
+++ b/scripts/functions/selector
@@ -7,7 +7,6 @@ source "${rvm_scripts_path}/functions/selector_interpreters"
 
 __rvm_select_set_variable_defaults()
 {
-  export -a rvm_configure_flags rvm_patch_names rvm_ree_options rvm_make_flags
   export GEM_HOME GEM_PATH MY_RUBY_HOME RUBY_VERSION IRBRC
   export rvm_env_string rvm_action rvm_alias_expanded rvm_archive_extension rvm_bin_flag rvm_bin_path rvm_debug_flag rvm_default_flag rvm_delete_flag rvm_docs_type rvm_dump_environment_flag rvm_error_message rvm_expanding_aliases rvm_file_name rvm_gemdir_flag rvm_gemset_name rvm_gemstone_package_file rvm_gemstone_url rvm_head_flag rvm_hook rvm_install_on_use_flag rvm_llvm_flag rvm_loaded_flag rvm_niceness rvm_nightly_flag rvm_only_path_flag rvm_parse_break rvm_patch_original_pwd rvm_pretty_print_flag rvm_proxy rvm_quiet_flag rvm_reload_flag rvm_remove_flag rvm_ruby_alias rvm_ruby_args rvm_ruby_binary rvm_ruby_bits rvm_ruby_configure rvm_ruby_file rvm_ruby_gem_home rvm_ruby_gem_path rvm_ruby_global_gems_path rvm_ruby_home rvm_ruby_interpreter rvm_ruby_irbrc rvm_ruby_major_version rvm_ruby_make rvm_ruby_make_install rvm_ruby_minor_version rvm_ruby_mode rvm_ruby_name rvm_ruby_package_file rvm_ruby_package_name rvm_ruby_patch rvm_ruby_patch_level rvm_ruby_release_version rvm_ruby_repo_url rvm_ruby_revision rvm_ruby_selected_flag rvm_ruby_sha rvm_ruby_string rvm_ruby_strings rvm_ruby_tag rvm_ruby_url rvm_ruby_user_tag rvm_ruby_version rvm_script_name rvm_sdk rvm_silent_flag rvm_sticky_flag rvm_system_flag rvm_token rvm_trace_flag rvm_use_flag rvm_user_flag rvm_verbose_flag rvm_wrapper_name
 }
diff --git a/scripts/functions/support b/scripts/functions/support
index 5a33a4cc46..931aa727f6 100644
--- a/scripts/functions/support
+++ b/scripts/functions/support
@@ -356,10 +356,10 @@ __rvm_curl_output_control()
   then
     __flags+=( "--silent" "--show-error" )
   elif
-    [[ " $*" =~ " -s" || " $*" =~ " --silent" ]]
+    [[ " $*" == *" -s"* || " $*" == *" --silent"* ]]
   then
     # make sure --show-error is used with --silent
-    [[ " $*" =~ " -S" || " $*" =~ " -sS" || " $*" =~ " --show-error" ]] ||
+    [[ " $*" == *" -S"* || " $*" == *" -sS"* || " $*" == *" --show-error"* ]] ||
     {
       __flags+=( "--show-error" )
     }
@@ -417,8 +417,12 @@ is_parent_of()
   while [[ -n "$pid" && "$pid" != "0" ]]
   do
     case "`uname`" in
-      (SunOS)   read ppid pname < <(\command \ps -p $pid -o ppid= -o comm=) ;;
-      (*)       read ppid pname < <(\command \ps -p $pid -o ppid= -o ucomm=) ;;
+      (SunOS)
+        read ppid pname <<<"$(\command \ps -p $pid -o ppid= -o comm=)"
+        ;;
+      (*)
+        read ppid pname <<<"$(\command \ps -p $pid -o ppid= -o ucomm=)"
+        ;;
     esac
     if [[ -n "$ppid" && -n "$pname" ]]
     then
@@ -442,7 +446,7 @@ __rvm_string_includes()
   shift
   for __search in "$@"
   do
-    if [[ " ${__text} " =~ " ${__search} " ]]
+    if [[ " ${__text} " == *" ${__search} "* ]]
     then return 0
     fi
   done
diff --git a/scripts/functions/utility b/scripts/functions/utility
index 47667cfe5a..b8c6c8a6b7 100755
--- a/scripts/functions/utility
+++ b/scripts/functions/utility
@@ -5,21 +5,6 @@ source "${rvm_scripts_path}/functions/utility_package"
 source "${rvm_scripts_path}/functions/utility_rubygems"
 source "${rvm_scripts_path}/functions/utility_system"
 
-printenv_null()
-{
-  if printenv --null >/dev/null 2>/dev/null
-  then
-    printenv --null
-  else
-    # this messes with escape sequences but allows new lines in variables
-    printenv | __rvm_sed '/=/ { s/=.*$//; p; }; d;' | while read name
-    do
-      zero="\0"
-      eval "eval \"printf '%b' '$name=\$$name$zero'\""
-    done
-  fi
-}
-
 __rvm_strings()
 {
   typeset strings ruby_strings
@@ -73,11 +58,11 @@ __rvm_remove_from_path()
 
   # remove multiple slashes https://github.com/wayneeseguin/rvm/issues/1364
   if
-    [[ "$PATH" =~ "//" || "$PATH" =~ "/:" ]]
+    [[ "$PATH" == *"//"* || "$PATH" == *"/:"* ]]
   then
     if [[ "${_system_type}" = "Darwin" ]]
-    then PATH="$(sed -E -e 's#/+#/#g' -e 's#/:#:#' <<<$PATH)"
-    else PATH="$(sed -r -e 's#/+#/#g' -e 's#/:#:#' <<<$PATH)"
+    then PATH="$(\sed -E -e 's#/+#/#g' -e 's#/:#:#' <<<$PATH)"
+    else PATH="$(\sed -r -e 's#/+#/#g' -e 's#/:#:#' <<<$PATH)"
     fi
   fi
 
@@ -379,7 +364,7 @@ __rvm_try_sudo()
         missing_paths=""
         for sbin_path in /sbin /usr/sbin /usr/local/sbin
         do
-          if [[ -d "${sbin_path}" ]] && [[ ! ":$PATH:" =~ ":${sbin_path}:" ]]
+          if [[ -d "${sbin_path}" ]] && [[ ":$PATH:" != *":${sbin_path}:"* ]]
           then missing_paths+=":${sbin_path}"
           fi
         done
@@ -402,7 +387,6 @@ __rvm_run_wrapper()
   action="${2:-}"
   shift 2
   rubies_string="${1:-}"
-  export -a args
   args=( $@ )
   source "$rvm_scripts_path"/base
   source "$rvm_scripts_path"/$file
diff --git a/scripts/functions/utility_logging b/scripts/functions/utility_logging
index 2e1e71d698..f6258a5b39 100644
--- a/scripts/functions/utility_logging
+++ b/scripts/functions/utility_logging
@@ -51,12 +51,12 @@ __rvm_log_command()
   shift 2
   _command=( "$@" )   # store full command so we can manipulate it
   _command_start="$1" # store first part so we can detect variables
-  while (( $# )) && [[ "$1" =~ "=" ]] # skip variables from beginning
+  while (( $# )) && [[ "$1" == *"="* ]] # skip variables from beginning
   do shift
   done
   _command_name="$1"  # store the real command so we can detect functions
 
-  [[ ! "${_command_start}" =~ "=" ]] || _command=( "env" "${_command[@]}" )
+  [[ "${_command_start}" != *"="* ]] || _command=( "env" "${_command[@]}" )
   if __function_on_stack __rvm_log_command_internal
   then __rvm_log_command_simple   "$@" || return $?
   else __rvm_log_command_internal "$@" || return $?
diff --git a/scripts/functions/utility_package b/scripts/functions/utility_package
index cfb287a7f7..e55e4b4387 100644
--- a/scripts/functions/utility_package
+++ b/scripts/functions/utility_package
@@ -32,7 +32,7 @@ __rvm_package_list()
 __rvm_package_extract_run()
 {
   if
-    [[ ! " ${rvm_tar_options:-} " =~ " --no-same-owner "  ]] &&
+    [[ " ${rvm_tar_options:-} " != *" --no-same-owner "*  ]] &&
     __rvm_tar --help 2>&1 | __rvm_grep -- --no-same-owner >/dev/null
   then
     rvm_tar_options="${rvm_tar_options:-}${rvm_tar_options:+ }--no-same-owner"
diff --git a/scripts/functions/utility_system b/scripts/functions/utility_system
index 52e7599cdf..d40a95d685 100644
--- a/scripts/functions/utility_system
+++ b/scripts/functions/utility_system
@@ -121,26 +121,26 @@ __rvm_detect_system()
       _system_version="$(command uname -v)"
       _system_arch="$(command uname -p)"
       if
-        [[ "${_system_version}" =~ ^joyent* ]]
+        [[ "${_system_version}" == joyent* ]]
       then
         _system_name="SmartOS"
         _system_version="${_system_version#* }"
       elif
-        [[ "${_system_version}" =~ ^omnios* ]]
+        [[ "${_system_version}" == omnios* ]]
       then
         _system_name="OmniOS"
         _system_version="${_system_version#* }"
       elif
-        [[ "${_system_version}" =~ ^oi* || "${_system_version}" =~ ^illumos* ]]
+        [[ "${_system_version}" == oi* || "${_system_version}" == illumos* ]]
       then
         _system_name="OpenIndiana"
         _system_version="${_system_version#* }"
       elif
-        [[ "${_system_version}" =~ Generic* ]]
+        [[ "${_system_version}" == Generic* ]]
       then
         _system_version="10"
       elif
-        [[ "${_system_version}" =~ 11* ]]
+        [[ "${_system_version}" == *11* ]]
       then
         _system_version="11"
       # is else needed here?
diff --git a/scripts/gemsets b/scripts/gemsets
index debfdcb561..98e74c1429 100755
--- a/scripts/gemsets
+++ b/scripts/gemsets
@@ -290,7 +290,7 @@ gemset_copy()
   if
     [[ -z "$destination_ruby" || -z "$source_ruby" ]]
   then
-    rvm_error "Source and destination must be specified: 'rvm gemset copy X Y'"
+    rvm_help gemset copy
     return 1
   fi
   # Verify the destination gemset exists before attempting to use it.
@@ -425,9 +425,9 @@ gemset_unpack()
   while read gem_name version _platforms
   do
     ( command gem unpack "$gem_name" -v"$version" --target "$directory" )&
-  done < <(
+  done <<<"$(
     GEM_PATH="$GEM_HOME" __rvm_list_gems
-  )
+  )"
   wait
   rvm_log "Unpacking into ${directory} complete\n"
   return 0
@@ -446,7 +446,7 @@ gemset_export()
   if
     [[ -n "$rvm_file_name" ]]
   then
-    [[ "${rvm_file_name}" =~ Gemfile ]] || rvm_file_name="${rvm_file_name%.gems}.gems"
+    [[ "${rvm_file_name}" == *Gemfile ]] || rvm_file_name="${rvm_file_name%.gems}.gems"
   else
     if [[ -n "$rvm_gemset_name" ]]
     then rvm_file_name="$rvm_gemset_name.gems"
@@ -458,7 +458,7 @@ gemset_export()
   then \command \rm -f "$rvm_file_name"
   fi
   if
-    [[ "${rvm_file_name}" =~ Gemfile ]]
+    [[ "${rvm_file_name}" == *Gemfile ]]
   then
     printf "%b" "source 'https://rubygems.org'
 
@@ -477,19 +477,19 @@ Append these after using a ';' field separator
   then
     while read gem_name version _platforms
     do
-      if [[ "${rvm_file_name}" =~ Gemfile ]]
+      if [[ "${rvm_file_name}" == *Gemfile ]]
       then echo "gem '$gem_name', '$version'"
       else echo "$gem_name -v$version"
       fi
-    done < <( GEM_PATH="$GEM_HOME" __rvm_list_gems )
+    done <<<"$( GEM_PATH="$GEM_HOME" __rvm_list_gems )"
   else
     while read gem_name versions
     do
-      if [[ "${rvm_file_name}" =~ Gemfile ]]
+      if [[ "${rvm_file_name}" == *Gemfile ]]
       then echo "gem '$gem_name'"
       else echo "$gem_name"
       fi
-    done < <( GEM_PATH="$GEM_HOME" gem list )
+    done <<<"$( GEM_PATH="$GEM_HOME" gem list )"
   fi >> "$rvm_file_name"
 }
 
@@ -537,9 +537,8 @@ gemset_prune()
     then
       \command \mv "$cached_file_path" "${temporary_cache_path}/${cached_gem_name}"
     fi
-  done < <(
-    GEM_PATH="$GEM_HOME" __rvm_list_gems
-  )
+  done <<<"$( GEM_PATH="$GEM_HOME" __rvm_list_gems )"
+
   rvm_log "Removing live cache and restoring temporary cache..."
   # Switch the cache back.
   __rvm_rm_rf "$live_cache_path"
@@ -605,25 +604,25 @@ gemset_actions_with_gem=(
   load pristine copy install initial prune rename update unpack
 )
 if
-  [[ " ${gemset_actions_with_gem[*]} " =~ " $action " ]] &&
+  [[ " ${gemset_actions_with_gem[*]} " == *" $action "* ]] &&
   ! builtin command -v gem > /dev/null
 then
   rvm_error "'gem' was not found, cannot perform gem actions (Do you have an RVM ruby selected?)"
   exit 1
 fi
 
-if [[ " $* " =~ " --force " ]]
+if [[ " $* " == *" --force "* ]]
 then export rvm_force_flag=1
 fi
 
 if
-  [[ -z "$rvm_ruby_string" && "${GEM_HOME:-""}" =~ "${rvm_path}" ]]
+  [[ -z "$rvm_ruby_string" && "${GEM_HOME:-""}" == "${rvm_path}"* ]]
 then
   rvm_ruby_string="${GEM_HOME##*/}"
   rvm_ruby_string="${rvm_ruby_string%%@*}"
 fi
 if
-  [[ -z "$rvm_gemset_name" && "${GEM_HOME:-""}" =~ "${rvm_path}" ]]
+  [[ -z "$rvm_gemset_name" && "${GEM_HOME:-""}" == "${rvm_path}"* ]]
 then
   rvm_gemset_name="${GEM_HOME##*/}"
   rvm_gemset_name="${rvm_gemset_name#${rvm_gemset_name%%@*}}"
diff --git a/scripts/initialize b/scripts/initialize
index aa854d765e..b6aea63407 100755
--- a/scripts/initialize
+++ b/scripts/initialize
@@ -12,6 +12,10 @@ then
   setopt extendedglob
   setopt kshglob
   setopt no_glob_subst
+elif
+  [[ -n "${KSH_VERSION:-}" ]]
+then
+  true # mksh
 else
   printf "%b" "What the heck kind of shell are you running here???\n"
 fi
@@ -137,7 +141,6 @@ Error:
     rvm_debug_flag:${rvm_debug_flag:=0} \
     rvm_gems_cache_path:${rvm_gems_cache_path:=${rvm_gems_path:-"$rvm_path/gems"}/cache}
 
-  export -a rvm_configure_env rvm_configure_flags rvm_patch_names rvm_ree_options rvm_make_flags
   export rvm_action rvm_alias_expanded rvm_archive_extension rvm_archives_path rvm_bin_flag rvm_bin_path rvm_debug_flag rvm_default_flag rvm_delete_flag rvm_docs_path rvm_docs_type rvm_dump_environment_flag rvm_environments_path rvm_error_message rvm_examples_path rvm_expanding_aliases rvm_file_name rvm_gemdir_flag rvm_gems_cache_path rvm_gems_path rvm_gemset_name rvm_gemset_separator rvm_gemsets_path rvm_gemstone_package_file rvm_gemstone_url rvm_head_flag rvm_help_path rvm_docs_path rvm_hook rvm_hooks_path rvm_install_on_use_flag rvm_lib_path rvm_llvm_flag rvm_loaded_flag rvm_log_path rvm_niceness rvm_nightly_flag rvm_only_path_flag rvm_parse_break rvm_patch_original_pwd rvm_patches_path rvm_path rvm_pretty_print_flag rvm_proxy rvm_quiet_flag rvm_reload_flag rvm_remove_flag rvm_repos_path rvm_rubies_path rvm_ruby_alias rvm_ruby_args rvm_ruby_binary rvm_ruby_bits rvm_ruby_configure rvm_ruby_file rvm_ruby_gem_home rvm_ruby_gem_path rvm_ruby_global_gems_path rvm_ruby_home rvm_ruby_interpreter rvm_ruby_irbrc rvm_ruby_major_version rvm_ruby_make rvm_ruby_make_install rvm_ruby_minor_version rvm_ruby_mode rvm_ruby_name rvm_ruby_package_file rvm_ruby_package_name rvm_ruby_patch rvm_ruby_patch_level rvm_ruby_release_version rvm_ruby_repo_url rvm_ruby_revision rvm_ruby_selected_flag rvm_ruby_sha rvm_ruby_string rvm_ruby_strings rvm_ruby_tag rvm_ruby_url rvm_ruby_user_tag rvm_ruby_version rvm_script_name rvm_scripts_path rvm_sdk rvm_user_install_flag rvm_silent_flag rvm_src_path rvm_sticky_flag rvm_system_flag rvm_tmp_path rvm_token rvm_trace_flag rvm_use_flag rvm_user_flag rvm_user_path rvm_usr_path rvm_verbose_flag rvm_wrapper_name rvm_wrappers_path rvm_ruby_repo_branch rvm_man_path rvm_remote_flag
 
 fi # if [[ -z "${rvm_tmp_path:-}" ]] || (( __rvm_env_loaded == 1 ))
diff --git a/scripts/install b/scripts/install
index 6e754bba8a..36efb80c7b 100755
--- a/scripts/install
+++ b/scripts/install
@@ -5,7 +5,7 @@ export PS4="+ \${BASH_SOURCE##\${rvm_path:-}} : \${FUNCNAME[0]:+\${FUNCNAME[0]}(
 
 # Tracing, if asked for - as early as possible
 if
-  [[ "$*" =~ --trace ]] || (( ${rvm_trace_flag:-0} > 0 ))
+  [[ "$*" == *--trace* ]] || (( ${rvm_trace_flag:-0} > 0 ))
 then
   set -x
   export rvm_trace_flag=1
diff --git a/scripts/mount b/scripts/mount
index 6b863409ad..7bff18656f 100755
--- a/scripts/mount
+++ b/scripts/mount
@@ -32,7 +32,7 @@ external_reject_existing()
   for __check
   do
     if
-      [[ "${__check}" =~ " ${__existing[*]} " ]]
+      [[ " ${__existing[*]} " == *" ${__check} "* ]]
     then
       __failed+=( ${__check} )
     fi
@@ -667,7 +667,7 @@ case "${action}" in
     }
     if
       (( rvm_remote_flag > 0 )) ||
-      [[ "$1" =~ ^http || "$1" =~ tar.bz2$ ]]
+      [[ "$1" == http* || "$1" == *tar.bz2 ]]
     then
       external_import "$@"
     else
diff --git a/scripts/notes b/scripts/notes
index 2600fe94aa..1b6f982819 100755
--- a/scripts/notes
+++ b/scripts/notes
@@ -267,7 +267,7 @@ $notes_type Notes:
 "
   fi | important_redirect
 
-  if [[ -n "${GEM_HOME:-}" ]] && ! [[ "${GEM_HOME}" =~ "$rvm_path/" ]]
+  if [[ -n "${GEM_HOME:-}" ]] && ! [[ "${GEM_HOME}" == "$rvm_path/"* ]]
   then
     important_message "
   * WARNING: you have GEM_HOME=\"${GEM_HOME}\" this is conflicting with RVM, make sure to:
diff --git a/scripts/osx-ssl-certs b/scripts/osx-ssl-certs
index 003c03b593..0de08ced2a 100755
--- a/scripts/osx-ssl-certs
+++ b/scripts/osx-ssl-certs
@@ -34,22 +34,22 @@ __rvm_osx_ssl_certs_run_filter_and_run()
       rvm_debug  "${__ruby} # getting openssl certs path"
       __rvm_osx_ssl_certs_file_from_openssl "${__ruby}" || return $?
       __path="$cert_file"
-      [[ " ${__paths[*]} " =~ " ${__path} " ]] || __paths+=( "${__path}" )
+      [[ " ${__paths[*]} " == *" ${__path} "* ]] || __paths+=( "${__path}" )
     elif
       [[ -f "${__ruby}" ]] &&
       __rvm_grep -- "-----BEGIN CERTIFICATE-----" "${__ruby}" 1>/dev/null 2>&1
     then
       rvm_debug  "${__ruby} # certs file"
-      [[ " ${__paths[*]} " =~ " ${__ruby} " ]] || __paths+=( "${__ruby}" )
+      [[ " ${__paths[*]} " == *" ${__ruby} "* ]] || __paths+=( "${__ruby}" )
     elif
       [[ -d "${__ruby}" ]]
     then
       rvm_debug  "${__ruby} # certs path"
-      [[ " ${__paths[*]} " =~ " ${__ruby} " ]] || __paths+=( "${__ruby}" )
+      [[ " ${__paths[*]} " == *" ${__ruby} "* ]] || __paths+=( "${__ruby}" )
     else
       rvm_debug  "${__ruby} # getting ruby certs path"
       __path="$( __rvm_with "${__ruby}" "__rvm_osx_ssl_certs_file_for_ruby" )"
-      [[ " ${__paths[*]} " =~ " ${__path} " ]] || __paths+=( "${__path}" )
+      [[ " ${__paths[*]} " == *" ${__path} "* ]] || __paths+=( "${__path}" )
     fi
   done
 
diff --git a/scripts/rvm b/scripts/rvm
index 840a282d6e..2116da1cb6 100755
--- a/scripts/rvm
+++ b/scripts/rvm
@@ -7,7 +7,7 @@
 # partial duplication marker dkjnkjvnckbjncvbkjnvkj
 # prevent from loading in sh shells
 if
-  builtin test -n "${BASH_VERSION:-}" -o -n "${ZSH_VERSION:-}"
+  builtin test -n "${BASH_VERSION:-}" -o -n "${ZSH_VERSION:-}" -o -n "${KSH_VERSION:-}"
 then
   case "`uname`" in
     (CYGWIN*) __shell_name="`\command \ps -p $$ | \command \awk 'END {print $NF}'` 2>/dev/null" ;;
@@ -15,7 +15,7 @@ then
     (*)       __shell_name="`\command \ps -p $$ -o ucomm=`" ;;
   esac
   case "$__shell_name" in
-    (""|dash|sh|*/dash|*/sh) return 0 ;; # silently stop in sh shells
+    (""|dash|sh|ksh|*/dash|*/sh|*/ksh) return 0 ;; # silently stop in sh shells
   esac
   unset __shell_name
 else
@@ -25,14 +25,21 @@ fi
 # also duplicated in scripts/base
 __rvm_has_opt()
 {
-  {
-    # pre-gnu
-    [[ -n "${ZSH_VERSION}"  ]] && setopt | GREP_OPTIONS="" \command \grep "^${1}$" >/dev/null 2>&1
-  } ||
-  {
-    [[ -n "${BASH_VERSION}" ]] && [[ ":$SHELLOPTS:" =~ ":${1}:" ]]
-  } ||
-  return 1
+  if # pre-gnu
+   [[ -n "${ZSH_VERSION}"  ]]
+  then
+    setopt | GREP_OPTIONS="" \command \grep "^${1}$" >/dev/null 2>&1 || return $?
+  elif # mksh
+    [[ -n "${KSH_VERSION}"  ]]
+  then
+    set +o | GREP_OPTIONS="" \command \grep "-o ${1}$" >/dev/null 2>&1 || return $?
+  elif # bash
+    [[ -n "${BASH_VERSION}" ]]
+  then
+    [[ ":$SHELLOPTS:" == *":${1}:"* ]] || return $?
+  else # what is this?!
+    return 1
+  fi
 }
 
 # Do not allow sourcing RVM in `sh` - it's not supported
diff --git a/scripts/wrapper b/scripts/wrapper
index 72117359c6..49697531b8 100755
--- a/scripts/wrapper
+++ b/scripts/wrapper
@@ -84,7 +84,7 @@ find_all_wrappers()
 }
 
 if
-  [[ " ${binaries[*]} " =~ " --all " ]]
+  [[ " ${binaries[*]} " == *" --all "* ]]
 then
   old_binaries=( "${binaries[@]}" )
   __rvm_read_lines binaries <(