diff --git a/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh b/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh
index 6649178..21628d5 100755
--- a/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh
+++ b/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh
@@ -1,6 +1,6 @@
 #! /bin/bash
 
-if [ -z $1 ] || [ $1 = "--help" ]; then
+if [ -z "$1" ] || [ "$1" = "--help" ]; then
   printf "%s\n" "Usage: app-cleaner.sh /path/to/app.app"
   exit 0
 fi
diff --git a/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh.sig b/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh.sig
index a1ebf36..08dbbb3 100644
--- a/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh.sig
+++ b/how-to-clean-uninstall-macos-apps-using-appcleaner-open-source-alternative/app-cleaner.sh.sig
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
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+=+Aog
 -----END PGP SIGNATURE-----
diff --git a/how-to-create-encrypted-paper-backup/qr-backup.sh b/how-to-create-encrypted-paper-backup/qr-backup.sh
index 6cabc60..9804d61 100755
--- a/how-to-create-encrypted-paper-backup/qr-backup.sh
+++ b/how-to-create-encrypted-paper-backup/qr-backup.sh
@@ -9,7 +9,7 @@ number_of_shares=5
 share_threshold=3
 
 positional=()
-while [[ $# -gt 0 ]]; do
+while [ $# -gt 0 ]; do
   argument="$1"
   case $argument in
     -h|--help)
diff --git a/how-to-create-encrypted-paper-backup/qr-backup.sh.sig b/how-to-create-encrypted-paper-backup/qr-backup.sh.sig
index 267aad3..a5f71ab 100644
--- a/how-to-create-encrypted-paper-backup/qr-backup.sh.sig
+++ b/how-to-create-encrypted-paper-backup/qr-backup.sh.sig
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
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+=k3W3
 -----END PGP SIGNATURE-----
diff --git a/how-to-create-encrypted-paper-backup/qr-clone.sh b/how-to-create-encrypted-paper-backup/qr-clone.sh
index 6180ba8..fa14ebf 100755
--- a/how-to-create-encrypted-paper-backup/qr-clone.sh
+++ b/how-to-create-encrypted-paper-backup/qr-clone.sh
@@ -4,7 +4,7 @@ set -e
 set -o pipefail
 
 positional=()
-while [[ $# -gt 0 ]]; do
+while [ $# -gt 0 ]; do
   argument="$1"
   case $argument in
     -h|--help)
diff --git a/how-to-create-encrypted-paper-backup/qr-clone.sh.sig b/how-to-create-encrypted-paper-backup/qr-clone.sh.sig
index 3b661d7..a212a6a 100644
--- a/how-to-create-encrypted-paper-backup/qr-clone.sh.sig
+++ b/how-to-create-encrypted-paper-backup/qr-clone.sh.sig
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
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 -----END PGP SIGNATURE-----
diff --git a/how-to-create-encrypted-paper-backup/qr-restore.sh b/how-to-create-encrypted-paper-backup/qr-restore.sh
index 1a8717c..1d62b3f 100755
--- a/how-to-create-encrypted-paper-backup/qr-restore.sh
+++ b/how-to-create-encrypted-paper-backup/qr-restore.sh
@@ -8,7 +8,7 @@ shamir_secret_sharing=false
 share_threshold=3
 
 positional=()
-while [[ $# -gt 0 ]]; do
+while [ $# -gt 0 ]; do
   argument="$1"
   case $argument in
     -h|--help)
diff --git a/how-to-create-encrypted-paper-backup/qr-restore.sh.sig b/how-to-create-encrypted-paper-backup/qr-restore.sh.sig
index a3eabb0..77ef294 100644
--- a/how-to-create-encrypted-paper-backup/qr-restore.sh.sig
+++ b/how-to-create-encrypted-paper-backup/qr-restore.sh.sig
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
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 -----END PGP SIGNATURE-----
diff --git a/how-to-create-encrypted-paper-backup/secure-erase.sh b/how-to-create-encrypted-paper-backup/secure-erase.sh
index 4c9d778..abf03fd 100755
--- a/how-to-create-encrypted-paper-backup/secure-erase.sh
+++ b/how-to-create-encrypted-paper-backup/secure-erase.sh
@@ -3,7 +3,7 @@
 rounds=3
 
 positional=()
-while [[ $# -gt 0 ]]; do
+while [ $# -gt 0 ]; do
   argument="$1"
   case $argument in
     -h|--help)
@@ -60,7 +60,7 @@ if [ "$answer" = "y" ]; then
     printf "%s\n" "Overwriting with random data… (round $round of $rounds)"
     sudo dd bs=1M if=/dev/urandom of=$dev
   done
-  if [ "$zero" = true ]; then
+  if [ $zero = true ]; then
     printf "%s\n" "Overwriting with zeros…"
     sudo dd bs=1M if=/dev/zero of=$dev
   fi
diff --git a/how-to-create-encrypted-paper-backup/secure-erase.sh.sig b/how-to-create-encrypted-paper-backup/secure-erase.sh.sig
index 68f4322..2eff4ae 100644
--- a/how-to-create-encrypted-paper-backup/secure-erase.sh.sig
+++ b/how-to-create-encrypted-paper-backup/secure-erase.sh.sig
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
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+=p3YS
 -----END PGP SIGNATURE-----
diff --git a/how-to-create-encrypted-paper-backup/trezor-restore.sh b/how-to-create-encrypted-paper-backup/trezor-restore.sh
index c041e6d..74ef16b 100755
--- a/how-to-create-encrypted-paper-backup/trezor-restore.sh
+++ b/how-to-create-encrypted-paper-backup/trezor-restore.sh
@@ -12,7 +12,7 @@ function cleanup()
 trap cleanup EXIT
 
 positional=()
-while [[ $# -gt 0 ]]; do
+while [ $# -gt 0 ]; do
   argument="$1"
   case $argument in
     -h|--help)
diff --git a/how-to-create-encrypted-paper-backup/trezor-restore.sh.sig b/how-to-create-encrypted-paper-backup/trezor-restore.sh.sig
index 3ad32de..2a6950f 100644
--- a/how-to-create-encrypted-paper-backup/trezor-restore.sh.sig
+++ b/how-to-create-encrypted-paper-backup/trezor-restore.sh.sig
@@ -1,16 +1,16 @@
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diff --git a/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh b/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh
index 61bd62b..266dddf 100755
--- a/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh
+++ b/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh
@@ -12,7 +12,7 @@ function cleanup()
 trap cleanup EXIT
 
 positional=()
-while [[ $# -gt 0 ]]; do
+while [ $# -gt 0 ]; do
   argument="$1"
   case $argument in
     -h|--help)
diff --git a/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh.sig b/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh.sig
index d7ceaf0..249971d 100644
--- a/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh.sig
+++ b/how-to-create-encrypted-paper-backup/trezor-verify-integrity.sh.sig
@@ -1,16 +1,16 @@
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diff --git a/how-to-make-sure-app-is-not-running-in-the-background-on-macos/README.md b/how-to-make-sure-app-is-not-running-in-the-background-on-macos/README.md
index 635baca..fa7f0cd 100644
--- a/how-to-make-sure-app-is-not-running-in-the-background-on-macos/README.md
+++ b/how-to-make-sure-app-is-not-running-in-the-background-on-macos/README.md
@@ -85,7 +85,7 @@ function kill-apps() {
   IFS=$'\n'
   red=$(tput setaf 1)
   normal=$(tput sgr0)
-  if [ -z $1 ] || [ $1 = "--help" ]; then
+  if [ -z "$1" ] || [ "$1" = "--help" ]; then
     printf "%s\n" "Usage: kill-apps string"
     return 0
   fi