diff --git a/_glyphs/compile.sh b/_glyphs/compile.sh
index 5927ef53a60..e127434010e 100755
--- a/_glyphs/compile.sh
+++ b/_glyphs/compile.sh
@@ -30,5 +30,5 @@ fontcustom compile "${dir}" \
   "--output=${target}" \
   --font-name=icons --templates=css --no-hash --force --autowidth --debug
 
-cat "${target}/icons.css" | sed -E "s|\"./icons([^\"]+)\"|\"https://www.yegor256.com/css/icons\1?$(date +%s)\"|g" > "${target}/icons.css"
+sed -E "s|\"./icons([^\"]+)\"|\"https://www.yegor256.com/css/icons\1?$(date +%s)\"|g" < "${target}/icons.css" > "${target}/icons.css"
 
diff --git a/_rake/ping.sh b/_rake/ping.sh
index 5a3547e9915..045bb0860dd 100755
--- a/_rake/ping.sh
+++ b/_rake/ping.sh
@@ -34,7 +34,7 @@ function ping_uri {
     -H 'Accept-Encoding: gzip, deflate' \
     -H 'Cache-Control: max-age=0' \
     --retry 4 \
-    --write-out '%{http_code} %{url_effective}\n' $1
+    --write-out '%{http_code} %{url_effective}\n' "$1"
 }
 export -f ping_uri
 
diff --git a/_rake/test_keywords.sh b/_rake/test_keywords.sh
index fb23ad6285c..b97f7150e04 100755
--- a/_rake/test_keywords.sh
+++ b/_rake/test_keywords.sh
@@ -20,12 +20,12 @@
 mkdir -p _temp
 rm -rf _temp/words.txt
 echo -n "fetching all words... "
-for f in $(find _site -name '*.html'); do
-  tidy -i -asxml $f 2>/dev/null | \
+find _site -name '*.html' | while IFS= read -r f; do
+  tidy -i -asxml "${f}" 2>/dev/null | \
     sed "s|>|>\n|g" | \
     xmllint -html -xpath '(//article//p|//article//h2|//article//h3|//article//h4)/text()' - 2>/dev/null | \
     sed "s/[^a-zA-Z]/ /g" | \
-    tr A-Z a-z | \
+    tr '[:upper:]' '[:lower:]' | \
     sed 's/[ \t\n]/\n/g' | \
     sed '/^[ \t]*$/d' >> _temp/words.txt
 done
@@ -33,21 +33,20 @@ echo -e "done, $(wc -l _temp/words.txt | cut -f1 -d ' ') words found"
 
 rm -rf _temp/good-words.txt
 echo -n "removing stop words... "
-cat _temp/words.txt | sort | uniq -c | sort -r | cut -c9- | \
-while read k; do
-  grep -q $k _travis/stop-words.txt
-  if [ $? -ne 0 ]; then
-    echo $k >> _temp/good-words.txt
+sort < _temp/words.txt | uniq -c | sort -r | cut -c9- | \
+while read -r k; do
+  if ! grep -q "${k}" _travis/stop-words.txt; then
+    echo "${k}" >> _temp/good-words.txt
   fi
 done
 echo "done, $(wc -l _temp/good-words.txt | cut -f1 -d ' ') good words left"
 
-cat _temp/good-words.txt | head -200 > _temp/top-words.txt
+head -200 < _temp/good-words.txt > _temp/top-words.txt
 
 errors=0
-while read k; do
+while read -r k; do
   echo -n "${k}: "
-  grep -q $k _temp/top-words.txt
+  grep -q "${k}" _temp/top-words.txt
   if [ $? -eq 1 ]; then
     echo "is absent!"
     ((errors++))
@@ -58,6 +57,6 @@ done < _travis/core-keywords.txt
 if [ "$errors" -ne "0" ]; then
   echo "there are ${errors} missed keywords, see above"
   cat _temp/top-words.txt
-  exit -1
+  exit 1
 fi