diff --git a/transmission/rootfs/etc/cont-init.d/19-config.sh b/transmission/rootfs/etc/cont-init.d/19-config.sh
index bc9e25e07..b845e4ca3 100644
--- a/transmission/rootfs/etc/cont-init.d/19-config.sh
+++ b/transmission/rootfs/etc/cont-init.d/19-config.sh
@@ -85,7 +85,7 @@ echo "${CONFIG}" >"$CONFIGDIR"/settings.json &&
 # USER and PASS
 ###############
 
-CONFIG=$(<$CONFIGDIR/settings.json)
+CONFIG=$(<"$CONFIGDIR"/settings.json)
 USER=$(bashio::config 'user')
 PASS=$(bashio::config 'pass')
 if bashio::config.has_value 'user'; then
@@ -98,7 +98,7 @@ fi
 CONFIG=$(bashio::jq "${CONFIG}" ".\"rpc-authentication-required\"=${BOOLEAN}")
 CONFIG=$(bashio::jq "${CONFIG}" ".\"rpc-username\"=\"${USER}\"")
 CONFIG=$(bashio::jq "${CONFIG}" ".\"rpc-password\"=\"${PASS}\"")
-echo "${CONFIG}" >$CONFIGDIR/settings.json &&
+echo "${CONFIG}" >"$CONFIGDIR"/settings.json &&
   jq . -S "$CONFIGDIR"/settings.json | cat >temp.json && mv temp.json "$CONFIGDIR"/settings.json
 
 # WHITELIST
diff --git a/ubooquity/rootfs/etc/32-nginx_ingress.sh b/ubooquity/rootfs/etc/32-nginx_ingress.sh
index 69ef19156..200598cb0 100644
--- a/ubooquity/rootfs/etc/32-nginx_ingress.sh
+++ b/ubooquity/rootfs/etc/32-nginx_ingress.sh
@@ -5,14 +5,14 @@
 # INGRESS SETTING #
 ###################
 declare port
-declare certfile
-declare ingress_interface
-declare ingress_port
-declare keyfile
+#declare certfile
+#declare ingress_interface
+#declare ingress_port
+#declare keyfile
 
 # General values
 port=$(bashio::addon.ingress_port)
-if [ $port ] >1; then
+if [ "$port" ] >1; then
   # Adapt nginx
   sed -i "s|%%port%%|$port|g" /etc/nginx/servers/ingress.conf
   sed -i "s|%%interface%%|$(bashio::addon.ip_address)|g" /etc/nginx/servers/ingress.conf
diff --git a/ubooquity/rootfs/etc/cont-init.d/32-nginx_ssl.sh b/ubooquity/rootfs/etc/cont-init.d/32-nginx_ssl.sh
index 1f5c37930..2c08711ca 100644
--- a/ubooquity/rootfs/etc/cont-init.d/32-nginx_ssl.sh
+++ b/ubooquity/rootfs/etc/cont-init.d/32-nginx_ssl.sh
@@ -6,8 +6,8 @@
 ###############
 declare port
 declare certfile
-declare ingress_interface
-declare ingress_port
+#declare ingress_interface
+#declare ingress_port
 declare keyfile
 
 # General values
diff --git a/ubooquity/rootfs/etc/cont-init.d/91-configuration.sh b/ubooquity/rootfs/etc/cont-init.d/91-configuration.sh
index 93352edf3..ca15ecd48 100644
--- a/ubooquity/rootfs/etc/cont-init.d/91-configuration.sh
+++ b/ubooquity/rootfs/etc/cont-init.d/91-configuration.sh
@@ -8,5 +8,5 @@ FILES=$(jq ".filesPaths[0].pathString" /config/addons_config/ubooquity/preferenc
 COMICS=$(jq ".comicsPaths[0].pathString" /config/addons_config/ubooquity/preferences.json)
 BOOKS=$(jq ".booksPaths[0].pathString" /config/addons_config/ubooquity/preferences.json)
 
-mkdir -p $FILES $COMICS $BOOKS /config/addons_config/ubooquity || true
-chown -R abc:abc $FILES $COMICS $BOOKS /config/addons_config/ubooquity || true
+mkdir -p "$FILES" "$COMICS" "$BOOKS" /config/addons_config/ubooquity || true
+chown -R abc:abc "$FILES" "$COMICS" "$BOOKS" /config/addons_config/ubooquity || true
diff --git a/ubooquity/rootfs/etc/cont-init.d/93-custom_webUI.sh b/ubooquity/rootfs/etc/cont-init.d/93-custom_webUI.sh
index 557c6cc7f..018168b39 100644
--- a/ubooquity/rootfs/etc/cont-init.d/93-custom_webUI.sh
+++ b/ubooquity/rootfs/etc/cont-init.d/93-custom_webUI.sh
@@ -11,7 +11,7 @@ if bashio::config.has_value 'theme'; then
   bashio::log.info "Alternate theme enabled : $CUSTOMUI. If webui don't work, disable this option"
 
   ### Download WebUI
-  case $CUSTOMUI in
+  case "$CUSTOMUI" in
   "comixology2")
     curl -s -S -J -L -o /data/release.zip https://github.com/scooterpsu/Comixology_Ubooquity_2/releases/download/v3.4/comixology2.zip >/dev/null &&
       unzip -o -q /data/release.zip -d /config/addons_config/ubooquity/themes/
@@ -29,6 +29,6 @@ if bashio::config.has_value 'theme'; then
   rm /data/release.zip || true
 
   ### Set preference
-  jq --arg variable $CUSTOMUI '.theme = $variable' /config/addons_config/ubooquity/preferences.json | sponge /config/addons_config/ubooquity/preferences.json
+  jq --arg variable "$CUSTOMUI" '.theme = $variable' /config/addons_config/ubooquity/preferences.json | sponge /config/addons_config/ubooquity/preferences.json
 
 fi
diff --git a/webtrees/rootfs/etc/cont-init.d/99-run.sh b/webtrees/rootfs/etc/cont-init.d/99-run.sh
index 6d8ce271f..328335ef6 100644
--- a/webtrees/rootfs/etc/cont-init.d/99-run.sh
+++ b/webtrees/rootfs/etc/cont-init.d/99-run.sh
@@ -1,5 +1,6 @@
 #!/usr/bin/env bashio
 # shellcheck shell=bash
+# shellcheck disable=SC2155
 
 ####################
 # GLOBAL VARIABLES #
@@ -71,7 +72,7 @@ if bashio::config.true 'ssl'; then
     #Send env variables
     export HTTPS=true
     export SSL=true
-    BASE_URL=$BASE_URL:$(bashio::addon.port 443)
+    BASE_URL="$BASE_URL":$(bashio::addon.port 443)
     export BASE_URL="${BASE_URL/http:/https:}"
 
     #Communication
@@ -86,34 +87,35 @@ bashio::log.info "Launching app, please wait"
 
 # Change data location
 echo "... update data with image"
-OLD_WEBTREES_HOME=$WEBTREES_HOME
+OLD_WEBTREES_HOME="$WEBTREES_HOME"
 export WEBTREES_HOME="/share/webtrees"
 cp -rn /var/www/webtrees "$(dirname "$OLD_WEBTREES_HOME")" &>/dev/null || true
-mkdir -p $WEBTREES_HOME
+mkdir -p "$WEBTREES_HOME"
 
 echo "... update permissions"
-chown -R www-data:www-data $OLD_WEBTREES_HOME
-chown -R www-data:www-data $WEBTREES_HOME
+chown -R www-data:www-data "$OLD_WEBTREES_HOME"
+chown -R www-data:www-data "$WEBTREES_HOME"
 
 # Make links with share
 echo "... make links with data in /share"
 for VOL in "data" "modules_v4"; do
-    mkdir -p $OLD_WEBTREES_HOME/$VOL
-    cp -rn $OLD_WEBTREES_HOME/$VOL $WEBTREES_HOME || true
-    rm -r $OLD_WEBTREES_HOME/$VOL || true
+    mkdir -p "$OLD_WEBTREES_HOME"/"$VOL"
+    cp -rn "$OLD_WEBTREES_HOME"/"$VOL" "$WEBTREES_HOME" || true
+    # shellcheck disable=SC2115
+    rm -r "$OLD_WEBTREES_HOME"/"$VOL" || true
     echo "... linking $VOL"
-    ln -s $WEBTREES_HOME/$VOL $OLD_WEBTREES_HOME
+    ln -s "$WEBTREES_HOME"/"$VOL" "$OLD_WEBTREES_HOME"
 done
 
-chown -R www-data:www-data $WEBTREES_HOME
+chown -R www-data:www-data "$WEBTREES_HOME"
 
 # Correct base url if needed
 echo "... align base url with latest addon value"
-if [ -f $WEBTREES_HOME/data/config.ini.php ]; then
+if [ -f "$WEBTREES_HOME"/data/config.ini.php ]; then
     echo "Aligning base_url addon config"
-    LINE=$(sed -n '/base_url/=' $WEBTREES_HOME/data/config.ini.php)
-    sed -i "$LINE a base_url=\"$BASE_URL\"" $WEBTREES_HOME/data/config.ini.php
-    sed -i "$LINE d" $WEBTREES_HOME/data/config.ini.php
+    LINE=$(sed -n '/base_url/=' "$WEBTREES_HOME"/data/config.ini.php)
+    sed -i "$LINE a base_url=\"$BASE_URL\"" "$WEBTREES_HOME"/data/config.ini.php
+    sed -i "$LINE d" "$WEBTREES_HOME"/data/config.ini.php
 fi || true
 
 # Execute main script
@@ -125,7 +127,7 @@ cd /
 # END INFO #
 ############
 
-DB_NAME=$(echo $DB_NAME | tr -d '"')
+DB_NAME=$(echo "$DB_NAME" | tr -d '"')
 
 bashio::log.info "Data is stored in $WEBTREES_HOME"
 bashio::log.info "Webui can be accessed at : $BASE_URL"