diff --git a/.github/workflows/check_shell_scripts.yml b/.github/workflows/check_shell_scripts.yml
new file mode 100644
index 000000000000..1a80281ec50a
--- /dev/null
+++ b/.github/workflows/check_shell_scripts.yml
@@ -0,0 +1,30 @@
+---
+name: check_shell_scripts
+
+# yamllint disable-line rule:truthy
+on:
+  workflow_dispatch:
+  push:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  run_shellcheck:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Install shellcheck
+        run: |
+          sudo apt-get install shellcheck
+
+      - name: display shellcheck version
+        run: |
+          shellcheck --version
+
+      - name: run check_shell_scripts
+        run: |
+          ./scripts/checkShellScripts.sh
+...
diff --git a/apps/librelingo-standalone-server/build.sh b/apps/librelingo-standalone-server/build.sh
index 0a637439cc42..bdebe3cc2dcb 100755
--- a/apps/librelingo-standalone-server/build.sh
+++ b/apps/librelingo-standalone-server/build.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -euo pipefail
+
 DIRNAME=$(dirname "$0")
 DEFAULT_OUTPUT_DIR="$DIRNAME/bin"
 if [ -n "$1" ]; then
@@ -29,7 +31,7 @@ cp -r "$WEBSITE_DIR" "$BUILD_DIR/static"
 cd "$DIRNAME"
 cp -r ./* "$BUILD_DIR"
 
-set -eux
+set -x
 cd "$BUILD_DIR"
 
 # prepare pkger
diff --git a/apps/web/package.json b/apps/web/package.json
index b2a5077dadc6..128e162059f7 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -15,7 +15,7 @@
     "installAllExternalCourses": "./scripts/installExternalCourses.sh",
     "fetchPhotos": "./scripts/fetchPhotos.sh",
     "fetchAudios": "./scripts/fetchAudios.sh",
-    "percypress": "sh ./percypress.sh",
+    "percypress": "bash ./percypress.sh",
     "test": "yarn dev & yarn percypress",
     "test:ci": "npx serve __sapper__/export -l 3000 & yarn percypress",
     "prettierfix": "yarn prettierfix:src && yarn prettierfix:cypress && yarn prettierfix:svelte",
diff --git a/apps/web/percypress.sh b/apps/web/percypress.sh
index 39b7211c3cfa..f53245f44dff 100644
--- a/apps/web/percypress.sh
+++ b/apps/web/percypress.sh
@@ -1,9 +1,12 @@
 #!/bin/bash
+
+set -euo pipefail
+
 # if [ "$KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC" = "" ]; then
 #   echo "KNAPSACK PRO NOT ENABLED"
 #   KNAPSACK_PRO_ENDPOINT=https://api-disabled-for-fork.knapsackpro.com \
 #     KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC=disabled-for-fork \
-#     KNAPSACK_PRO_MAX_REQUEST_RETRIES=0 
+#     KNAPSACK_PRO_MAX_REQUEST_RETRIES=0
 #     # percy exec -- yarn cy:run
 #     yarn cy:run
 # else
diff --git a/apps/web/scripts/fetchPhoto.sh b/apps/web/scripts/fetchPhoto.sh
index 71d1d041a6c8..aec10834b1db 100755
--- a/apps/web/scripts/fetchPhoto.sh
+++ b/apps/web/scripts/fetchPhoto.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 url=$(echo "$1" | cut -d',' -f2)
 image_name=$(echo "$1" | cut -d',' -f1)
 image_id=$(echo "$url" | cut -d'/' -f5)
diff --git a/apps/web/scripts/fetchPhotos.sh b/apps/web/scripts/fetchPhotos.sh
index 0de7f97a692e..74a406eb799d 100755
--- a/apps/web/scripts/fetchPhotos.sh
+++ b/apps/web/scripts/fetchPhotos.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 tail -n +2 ../../docs/image_attributions.csv | while read -r photo_description; do \
     ./scripts/fetchPhoto.sh "$photo_description"; \
 done
diff --git a/apps/web/scripts/installExternalCourse.sh b/apps/web/scripts/installExternalCourse.sh
index 127134b1ed0c..e0b4e124d54c 100755
--- a/apps/web/scripts/installExternalCourse.sh
+++ b/apps/web/scripts/installExternalCourse.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 wget "$1" -O temp.zip
 unzip temp.zip "*/course/*" -d ../../courses/"$2"
 mv ../../courses/"$2"/*/course/* ../../courses/"$2"
diff --git a/apps/web/scripts/installExternalCourses.sh b/apps/web/scripts/installExternalCourses.sh
index f84019b81ee1..1cfd959ae66c 100755
--- a/apps/web/scripts/installExternalCourses.sh
+++ b/apps/web/scripts/installExternalCourses.sh
@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 yarn installCourse "https://github.com/LibreLingo/LibreLingo-ES-from-EN/archive/refs/heads/main.zip" spanish-from-english
 yarn installCourse https://codeberg.org/Lamdarer/LibreLingo-DE-from-EN/archive/main.zip german-from-english
 yarn installCourse "https://github.com/szabgab/LibreLingo-Judeo-Spanish-from-English/archive/refs/heads/main.zip" ladino-from-english
 yarn installCourse "https://github.com/szabgab/LibreLingo-Judeo-Spanish-from-Spanish/archive/refs/heads/main.zip" ladino-from-spanish
 yarn installCourse "https://github.com/szabgab/LibreLingo-Judeo-Spanish-from-Hebrew/archive/refs/heads/main.zip" ladino-from-hebrew
-
diff --git a/apps/web/scripts/updateAllCourseData.sh b/apps/web/scripts/updateAllCourseData.sh
index 1a4b5d6883d8..8332c222848b 100755
--- a/apps/web/scripts/updateAllCourseData.sh
+++ b/apps/web/scripts/updateAllCourseData.sh
@@ -1,8 +1,10 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 if output=$(git status --porcelain) && [ -z "$output" ]; then
   echo "Working directory clean. Fetching course data..."
-else 
+else
   echo "Working directory not clean. Please commit your changes before running this script."
   exit 1
 fi
diff --git a/scripts/checkShellScripts.sh b/scripts/checkShellScripts.sh
new file mode 100755
index 000000000000..76d3ab6ba799
--- /dev/null
+++ b/scripts/checkShellScripts.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+declare -i exit_code=0
+
+if [[ $(basename "$PWD") != "LibreLingo" ]]; then
+  printf "Start this script from the root directory of the project.\n"
+  exit 2
+fi
+
+while IFS="" read -r cur_script
+do
+  printf "Checking \"%s\"\n" "${cur_script}"
+    if ! shellcheck "$cur_script"; then
+      exit_code=1
+    fi
+    if ! grep -q "set -euo pipefail" "$cur_script"; then
+      printf "add \"set -euo pipefail\"\n"
+      exit_code=1
+    fi
+done < <(find . -name "*.sh" -not -path "./node_modules/*")
+
+exit "$exit_code"
diff --git a/scripts/exportAllYamlCourses.sh b/scripts/exportAllYamlCourses.sh
index f996a29d4a93..184e3da344c6 100755
--- a/scripts/exportAllYamlCourses.sh
+++ b/scripts/exportAllYamlCourses.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -euo pipefail
+
 ANY_FAILED="0"
 for d in ./courses/*/ ; do
 		d=$(echo "$d" | sed 's/[^/]*\/[^/]*\///' | sed 's/\///')
diff --git a/scripts/exportYamlCourse.sh b/scripts/exportYamlCourse.sh
index da5241e73397..6381b79a8aef 100755
--- a/scripts/exportYamlCourse.sh
+++ b/scripts/exportYamlCourse.sh
@@ -1,13 +1,14 @@
 #!/bin/bash
 
+set -euo pipefail
+
 echo -en "⏳ Exporting course $1"
 cd ./apps/librelingo_json_export/ ||
 {
   echo -en "\r⚠️  Wrong folder structure"
   exit 1
 }
-poetry run export-cli ../../courses/"$1" ../../apps/web/src/courses/"$1"
-if [ $? -eq 0 ]; then
+if poetry run export-cli ../../courses/"$1" ../../apps/web/src/courses/"$1"; then
 		echo -en "\r✅ Exported course $1"
 else
 		echo -en "\r⚠️  Couldn't export course $1"
diff --git a/scripts/runAutoMaintenance.sh b/scripts/runAutoMaintenance.sh
index 8f58143a1599..ad8e2dc65cac 100755
--- a/scripts/runAutoMaintenance.sh
+++ b/scripts/runAutoMaintenance.sh
@@ -1,4 +1,6 @@
 #!/bin/bash
 
+set -euo pipefail
+
 yarn exportAllCourses
 ./scripts/updatePypiReadmeFiles.sh
diff --git a/scripts/updateAudioForAllYamlCourses.sh b/scripts/updateAudioForAllYamlCourses.sh
index 262117912ecc..7b26317e3f2d 100755
--- a/scripts/updateAudioForAllYamlCourses.sh
+++ b/scripts/updateAudioForAllYamlCourses.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -euo pipefail
+
 for d in ./courses/*/ ; do
 		d=$(echo "$d" | sed 's/[^/]*\/[^/]*\///' | sed 's/\///')
 		./scripts/updateAudioForYamlCourse.sh "$d" "$@"
diff --git a/scripts/updateAudioForYamlCourse.sh b/scripts/updateAudioForYamlCourse.sh
index efe5a5fd642b..64f3b5d65ea9 100755
--- a/scripts/updateAudioForYamlCourse.sh
+++ b/scripts/updateAudioForYamlCourse.sh
@@ -1,13 +1,14 @@
 #!/bin/bash
 
+set -euo pipefail
+
 echo -en "⏳ Updating audio for course $1"
 cd ./apps/librelingo_audios/ ||
 {
   echo -en "\r⚠️  Wrong folder structure"
   exit 1
 }
-poetry run python librelingo_audios/cli.py ../../courses/"$1" ../../apps/web/static/voice "$1" "${@:2}"
-if [ $? -eq 0 ]; then
+if poetry run python librelingo_audios/cli.py ../../courses/"$1" ../../apps/web/static/voice "$1" "${@:2}"; then
 		echo -en "\r✅ Updated audio for course $1"
 else
 		echo -en "\r⚠️  Couldn't update audio for course $1"
diff --git a/scripts/updatePypiReadmeFiles.sh b/scripts/updatePypiReadmeFiles.sh
index ec145d7746a9..e5f5fac3b57e 100755
--- a/scripts/updatePypiReadmeFiles.sh
+++ b/scripts/updatePypiReadmeFiles.sh
@@ -1,14 +1,25 @@
 #!/bin/bash
 
-for directory in $(find apps/ -name pyproject.toml | xargs -n1 dirname); do
-	echo "Updating README.md for Python package '$(basename "$directory")'..."
-	cd "$directory" ||
-	{
-		echo -en "\r⚠️  Could not enter $directory"
-		exit 1
-	}
-	poetry install
-	make README.md -B "$1"
-	cd -
-	echo
-done
+set -euo pipefail
+
+find apps/ -name pyproject.toml -exec dirname {} \; |
+  while IFS="" read -r directory
+    do
+			echo "Updating README.md for Python package '$(basename "$directory")'..."
+			cd "$directory" ||
+			{
+				echo -en "\r⚠️  Could not enter $directory"
+				exit 1
+			}
+			poetry install
+			make README.md -B ||
+      {
+        echo -en "\r⚠️  Could not update README.md for Python package '$(basename "$directory")'..."
+      }
+			cd - ||
+			{
+				echo -en "\r⚠️  Could not return to previous directory"
+				exit 1
+			}
+			echo
+    done
diff --git a/scripts/verifyPypiReadmeFiles.sh b/scripts/verifyPypiReadmeFiles.sh
index 69b29e70319a..e04b800e8344 100755
--- a/scripts/verifyPypiReadmeFiles.sh
+++ b/scripts/verifyPypiReadmeFiles.sh
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-./scripts/updatePypiReadmeFiles.sh -B
+set -euo pipefail
+
+./scripts/updatePypiReadmeFiles.sh
 
 if git diff --exit-code --name-only; then
 	echo "🎉 Amazing, PyPi readme files are up to date"
diff --git a/scripts/verifyTestCourseJsonFiles.sh b/scripts/verifyTestCourseJsonFiles.sh
index ab4ec0445a86..57236ff1dc28 100755
--- a/scripts/verifyTestCourseJsonFiles.sh
+++ b/scripts/verifyTestCourseJsonFiles.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -euo pipefail
+
 yarn exportCourse test
 
 if git diff --exit-code --name-only; then