diff --git a/examples/background-scripts/mycommands.sh b/examples/background-scripts/mycommands.sh
index 9a813e4..79bf773 100644
--- a/examples/background-scripts/mycommands.sh
+++ b/examples/background-scripts/mycommands.sh
@@ -6,12 +6,12 @@ export res
 # your additional bashbot commands ...
 mycommands() {
 
-	case "$MESSAGE" in
+	case "${MESSAGE}" in
 		'/run_'*) 
 			myback="run_${MESSAGE#*_}"
 			if [ -x "./${myback}.sh" ]; then
 			    checkback "${myback}"
-			    if [ "$res" -gt 0 ] ; then
+			    if [ "${res}" -gt 0 ] ; then
 				send_normal_message "${CHAT[ID]}" "Start ${myback}, use /kill${myback} to stop it."
 				background "./${myback}.sh" "${myback}"
 			    else
@@ -23,7 +23,7 @@ mycommands() {
 			myback="run_${MESSAGE#*_}"
 			if [ -x "./${myback}.sh" ]; then
 			    checkback "${myback}"
-			    if [ "$res" -eq 0 ] ; then
+			    if [ "${res}" -eq 0 ] ; then
 				killback "${myback}"
 				send_normal_message "${CHAT[ID]}" "Stopping ${myback}, use /run_${myback} to start again."
 			    else
@@ -56,7 +56,7 @@ watch_dir_loop() {
 		echo "$(date): new file: ${newfile}" >>"$0.log"
 		# note: loop callback must a function in the calling script! 
 		if _is_function loop_callback ; then
-			loop_callback "$1/$newfile"
+			loop_callback "$1/${newfile}"
 		else
 			echo "ERROR: loop_callback not found!" >&2
 			exit 1
@@ -94,8 +94,8 @@ output_file() {
 	sed <<< "${1}" '
 	s/ *mynewlinestartshere */\n/
 	s/ my[a-z]\{3,15}\(start\|ends\)here.*//g
-	' >"$publish$$"
-	cat  "$publish" >>"$publish$$"
+	' >"${publish}$$"
+	cat  "${publish}" >>"${publish}$$"
 	mv "${publish}$$" "${publish}"
 } # >>"$0.log" 2>&1
 
diff --git a/examples/background-scripts/run_diskusage.sh b/examples/background-scripts/run_diskusage.sh
index eadbfbe..e0d3660 100755
--- a/examples/background-scripts/run_diskusage.sh
+++ b/examples/background-scripts/run_diskusage.sh
@@ -4,7 +4,7 @@
 #
 # This file is public domain in the USA and all free countries.
 # Elsewhere, consider it to be WTFPLv2. (wtfpl.net/txt/copying)
-#### $$VERSION$$ v1.21-0-gc85af77
+#### $$VERSION$$ v1.25-dev-7-g9ef8778
 
 ######
 # parameters
@@ -28,8 +28,8 @@ cat >/dev/null &
 source "./mycommands.sh"
 
 # check if $1 is a number
-re='^[0-9]+$'
-if [[ $1 =~ $re ]] ; then
+regex='^[0-9]+$'
+if [[ $1 =~ ${regex} ]] ; then
 	SLEEP="$1"
 else
 	SLEEP=100 # time between time notifications
@@ -39,11 +39,11 @@ NEWLINE=$'\n'
 
 # output disk usage every $1 seconds
 WAIT=0
-while sleep $WAIT
+while sleep "${WAIT}"
 do
 	output_telegram "Current Disk usage ${NEWLINE} $(df -h / /tmp /usr /var /home)"
 	# only for testing, delete echo line for production ...
 	echo "Current Disk usage ${NEWLINE} $(df -h / /tmp /usr /var /home)"
-	WAIT="$SLEEP"
+	WAIT="${SLEEP}"
 done
 
diff --git a/examples/background-scripts/run_filecontent.sh b/examples/background-scripts/run_filecontent.sh
index 04cbfdd..8194ff9 100755
--- a/examples/background-scripts/run_filecontent.sh
+++ b/examples/background-scripts/run_filecontent.sh
@@ -2,7 +2,7 @@
 # file:  run_filename
 # background job to display content of all new files in WATCHDIR
 #
-#### $$VERSION$$ v1.21-0-gc85af77
+#### $$VERSION$$ v1.25-dev-7-g9ef8778
 
 ######
 # parameters
@@ -40,4 +40,4 @@ loop_callback() {
 	output_telegram "Contents of ${1}: ${NEWLINE} $(cat "${1}")"
 }
 
-watch_dir_loop "$WATCHDIR"
+watch_dir_loop "${WATCHDIR}"
diff --git a/examples/background-scripts/run_filename.sh b/examples/background-scripts/run_filename.sh
index 1b562e6..fb1a85e 100755
--- a/examples/background-scripts/run_filename.sh
+++ b/examples/background-scripts/run_filename.sh
@@ -2,7 +2,7 @@
 # file:  run_filename
 # background job to display all new files in WATCHDIR
 #
-#### $$VERSION$$ v1.21-0-gc85af77
+#### $$VERSION$$ v1.25-dev-7-g9ef8778
 
 ######
 # parameters
@@ -38,5 +38,5 @@ loop_callback() {
 	echo "New file ${1} created in ${WATCHDIR}!"
 }
 
-watch_dir_loop "$WATCHDIR"
+watch_dir_loop "${WATCHDIR}"
 
diff --git a/examples/background-scripts/run_notify.sh b/examples/background-scripts/run_notify.sh
index 67cf313..3140de8 100755
--- a/examples/background-scripts/run_notify.sh
+++ b/examples/background-scripts/run_notify.sh
@@ -4,7 +4,7 @@
 #
 # This file is public domain in the USA and all free countries.
 # Elsewhere, consider it to be WTFPLv2. (wtfpl.net/txt/copying)
-#### $$VERSION$$ v1.21-0-gc85af77
+#### $$VERSION$$ v1.25-dev-7-g9ef8778
 
 ######
 # parameters
@@ -25,15 +25,15 @@ unset IFS
 cat >/dev/null & 
 
 # check if $1 is a number
-re='^[0-9]+$'
-if [[ $1 =~ $re ]] ; then
+regex='^[0-9]+$'
+if [[ "$1" =~ ${regex} ]] ; then
 	SLEEP="$1"
 else
 	SLEEP=10 # time between time notifications
 fi
 
 # output current time every $1 seconds
-while sleep $SLEEP
+while sleep "${SLEEP}"
 do
 	date "+* It's %k:%M:%S o' clock ..."
 done
diff --git a/examples/jsonDB-keyboard/mycommands.sh b/examples/jsonDB-keyboard/mycommands.sh
index 2352974..7505c42 100644
--- a/examples/jsonDB-keyboard/mycommands.sh
+++ b/examples/jsonDB-keyboard/mycommands.sh
@@ -10,7 +10,7 @@
 #        AUTHOR: KayM (), kay@rrr.de
 #          DATE: 19.12.2020 19:03
 #
-#### $$VERSION$$ v1.21-0-gc85af77
+#### $$VERSION$$ v1.25-dev-7-g9ef8778
 #===============================================================================
 # shellcheck disable=SC2154
 # shellcheck disable=SC2034
@@ -326,8 +326,8 @@ fi
 	MYKEYF="$2"
 	MINLEN="4"
 	# check len of keys
-	for MYKEY in ${MYFIND}; do [ "${#MYKEY}" -lt ${MINLEN} ] && break; done
-	if [ "${#MYKEY}" -lt ${MINLEN} ]; then
+	for MYKEY in ${MYFIND}; do [ "${#MYKEY}" -lt "${MINLEN}" ] && break; done
+	if [ "${#MYKEY}" -lt "${MINLEN}" ]; then
 		send_markdownv2_message "${CHAT[ID]}" "*Ein Suchbegriff ist kürzer als ${MINLEN} Zeichen!*"
 	else
 		MYFIND="$(create_pattern "${MYFIND}")"
diff --git a/examples/send-system-status/mycommands.sh b/examples/send-system-status/mycommands.sh
index 2704143..148437f 100644
--- a/examples/send-system-status/mycommands.sh
+++ b/examples/send-system-status/mycommands.sh
@@ -5,7 +5,7 @@
 # to show how you can customize bashbot by only editing mycommands.sh
 # NOTE: this is not tested, simply copied from original source and reworked!
 #
-#### $$VERSION$$ v1.21-0-gc85af77
+#### $$VERSION$$ v1.25-dev-7-g9ef8778
 #
 # shellcheck disable=SC2154
 # shellcheck disable=SC2034
@@ -38,7 +38,7 @@ mycommands() {
     local msg=""
 
     if user_is_botadmin "${USER[ID]}" || user_is_allowed "${USER[ID]}" "systemstatus"; then
-	case "$CMD" in
+	case "${CMD}" in
 		'/md'*) msg="$(cat /proc/mdstat)";;
 		'/smb'*) msg="$(smbstatus)" ;;
 		'/se'*) msg="$(sensors | sed -r 's/\s|\)+//g' | sed -r 's/\(high=|\(min=/\//' | sed -r 's/\,crit=|\,max=/\//')";;
@@ -51,14 +51,14 @@ mycommands() {
 		'/smart'*)
 			[ "${CMD[1]}" == "" ] && msg="example \`/smart sda\`" && return
 			drive="$(echo "${CMD[1]}" | cut -c 1-3)"
-			echo "smartctl -a /dev/$drive"
-			msg="$(smartctl -a "/dev/$drive")"
+			echo "smartctl -a /dev/${drive}"
+			msg="$(smartctl -a "/dev/${drive}")"
 			;;
 		'/df') msg="$(df -h | sed -r 's/^/\n/' | sed -r 's/\s+/\n/g')";;
 	esac
 
-	if [ "$msg" != "" ]; then
-		send_normal_message "${CHAT[ID]}" "$msg" 
+	if [ "${msg}" != "" ]; then
+		send_normal_message "${CHAT[ID]}" "${msg}" 
 	fi
     else
 	send_normal_message "${USER[ID]}" "Sorry, you are not allowed to use this bot!"