diff --git a/terraform_fmt.sh b/terraform_fmt.sh
index d280574d1..6a8c52316 100755
--- a/terraform_fmt.sh
+++ b/terraform_fmt.sh
@@ -1,34 +1,89 @@
 #!/usr/bin/env bash
-set -e
+set -eo pipefail
 
-declare -a paths
-declare -a tfvars_files
+main() {
+  initialize_
+  parse_cmdline_ "$@"
+  terraform_fnt_
+}
 
-index=0
+initialize_() {
+  # get directory containing this script
+  local dir
+  local source
+  source="${BASH_SOURCE[0]}"
+  while [[ -L $source ]]; do # resolve $source until the file is no longer a symlink
+    dir="$(cd -P "$(dirname "$source")" > /dev/null && pwd)"
+    source="$(readlink "$source")"
+    # if $source was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+    [[ $source != /* ]] && source="$dir/$source"
+  done
+  _SCRIPT_DIR="$(dirname "$source")"
 
-for file_with_path in "$@"; do
-  file_with_path="${file_with_path// /__REPLACED__SPACE__}"
+  # source getopt function
+  # shellcheck source=lib_getopt
+  . "$_SCRIPT_DIR/lib_getopt"
+}
 
-  paths[index]=$(dirname "$file_with_path")
+parse_cmdline_() {
+  declare argv
+  argv=$(getopt -o a: --long args: -- "$@") || return
+  eval "set -- $argv"
 
-  if [[ "$file_with_path" == *".tfvars" ]]; then
-    tfvars_files+=("$file_with_path")
-  fi
+  for argv; do
+    case $argv in
+      -a | --args)
+        shift
+        ARGS+=("$1")
+        shift
+        ;;
+      --)
+        shift
+        FILES=("$@")
+        break
+        ;;
+    esac
+  done
+}
 
-  let "index+=1"
-done
+terraform_fmt_() {
 
-for path_uniq in $(echo "${paths[*]}" | tr ' ' '\n' | sort -u); do
-  path_uniq="${path_uniq//__REPLACED__SPACE__/ }"
+  declare -a paths
+  declare -a tfvars_files
 
-  pushd "$path_uniq" > /dev/null
-  terraform fmt
-  popd > /dev/null
-done
+  index=0
 
-# terraform.tfvars are excluded by `terraform fmt`
-for tfvars_file in "${tfvars_files[@]}"; do
-  tfvars_file="${tfvars_file//__REPLACED__SPACE__/ }"
+  for file_with_path in "${FILES[@]}"; do
+    file_with_path="${file_with_path// /__REPLACED__SPACE__}"
 
-  terraform fmt "$tfvars_file"
-done
+    paths[index]=$(dirname "$file_with_path")
+
+    if [[ "$file_with_path" == *".tfvars" ]]; then
+      tfvars_files+=("$file_with_path")
+    fi
+
+    (( index+=1 ))
+  done
+
+  for path_uniq in $(echo "${paths[*]}" | tr ' ' '\n' | sort -u); do
+    path_uniq="${path_uniq//__REPLACED__SPACE__/ }"
+
+    (
+      cd "$path_uniq"
+      terraform fmt "${ARGS[@]}"
+    )
+  done
+
+  # terraform.tfvars are excluded by `terraform fmt`
+  for tfvars_file in "${tfvars_files[@]}"; do
+    tfvars_file="${tfvars_file//__REPLACED__SPACE__/ }"
+
+    terraform fmt "${ARGS[@]}" "$tfvars_file"
+  done
+}
+
+# global arrays
+declare -a ARGS=()
+declare -a FILES=()
+
+[[ ${BASH_SOURCE[0]} != "$0" ]] || main "$@"