diff --git a/rootfs/etc/s6-overlay/s6-rc.d/init-install-resources/run b/rootfs/etc/s6-overlay/s6-rc.d/init-install-resources/run
index 7b26d93..c37c89d 100755
--- a/rootfs/etc/s6-overlay/s6-rc.d/init-install-resources/run
+++ b/rootfs/etc/s6-overlay/s6-rc.d/init-install-resources/run
@@ -1,9 +1,11 @@
 #!/command/with-contenv bash
+# shellcheck shell=bash
 
 # Install plugin
 installPlugin() {
-    ARCHIVE="$(wp-plugin download "${@}" 2>/dev/null)"
-    if [ -z "${ARCHIVE}" ]; then
+    local pluginArchive
+    pluginArchive="$(wp-plugin download "${@}" 2>/dev/null)"
+    if [ -z "${pluginArchive}" ]; then
         return 1
     fi
 
@@ -12,27 +14,30 @@ installPlugin() {
 }
 
 checkInstalled() {
-    FAILED_COUNT=0
+    local failedCount=0
+    local pluginSlug
+    local pluginExpr
+    local plugin
 
-    for PLUGIN_EXPR in ${PLUGIN_LIST}; do
-        IFS=':' read -ra PLUGIN <<<"${PLUGIN_EXPR}"
+    for pluginExpr in ${PLUGIN_LIST}; do
+        IFS=':' read -ra plugin <<<"${pluginExpr}"
 
-        PLUGIN_SLUG="${PLUGIN[0]}"
+        pluginSlug="${plugin[0]}"
 
-        if wp-plugin check "${PLUGIN_SLUG}"; then
-            echo "Plugin '${PLUGIN_SLUG}' installed"
+        if wp-plugin check "${pluginSlug}"; then
+            echo "Plugin '${pluginSlug}' installed"
             continue
         fi
 
-        ((FAILED_COUNT = FAILED_COUNT + 1))
-        echo "Warning: Plugin '${PLUGIN_SLUG}' failed to install"
+        ((failedCount = failedCount + 1))
+        echo "Warning: Plugin '${pluginSlug}' failed to install"
     done
 
-    if [ "${FAILED_COUNT}" = "0" ]; then
+    if [ "${failedCount}" = "0" ]; then
         return 0
     fi
 
-    echo "Total of ${FAILED_COUNT} plugins failed to install"
+    echo "Total of ${failedCount} plugins failed to install"
     return 1
 }
 
@@ -40,7 +45,11 @@ checkInstalled() {
 function taskInstallPlugins() {
     export WP_PLUGINS_PATH
 
-    CONCURRENCY_LIMIT="${WP_PLUGINS_INSTALL_CONCURRENCY:-5}"
+    local concurrencyLimit="${WP_PLUGINS_INSTALL_CONCURRENCY:-5}"
+    local pluginSlug
+    local pluginVersion
+    local pluginExpr
+    local plugin
 
     echo "Automated WordPress Plugins Installer"
     if [ -z "${PLUGIN_LIST}" ]; then
@@ -49,30 +58,30 @@ function taskInstallPlugins() {
     fi
 
     echo "About to install defined plugins"
-    for PLUGIN_EXPR in ${PLUGIN_LIST}; do
+    for pluginExpr in ${PLUGIN_LIST}; do
 
         # Split plugin name and version
-        IFS=':' read -ra PLUGIN <<<"${PLUGIN_EXPR}"
+        IFS=':' read -ra plugin <<<"${pluginExpr}"
 
-        PLUGIN_SLUG="${PLUGIN[0]}"
-        PLUGIN_VERSION="${PLUGIN[1]:-}"
+        pluginSlug="${plugin[0]}"
+        pluginVersion="${plugin[1]:-}"
 
-        if wp-plugin check "${PLUGIN_SLUG}"; then
-            echo "Plugin '${PLUGIN_SLUG}' already installed and will be skipped."
+        if wp-plugin check "${pluginSlug}"; then
+            echo "Plugin '${pluginSlug}' already installed and will be skipped."
             continue
         fi
 
-        if [ -n "${PLUGIN_VERSION}" ]; then
-            echo "Installing plugin '${PLUGIN_SLUG}' version '${PLUGIN_VERSION}'"
-            installPlugin "${PLUGIN_SLUG}" "${PLUGIN_VERSION}" &
+        if [ -n "${pluginVersion}" ]; then
+            echo "Installing plugin '${pluginSlug}' version '${pluginVersion}'"
+            installPlugin "${pluginSlug}" "${pluginVersion}" &
         else
-            echo "Installing plugin '${PLUGIN_SLUG}'"
-            installPlugin "${PLUGIN_SLUG}" &
+            echo "Installing plugin '${pluginSlug}'"
+            installPlugin "${pluginSlug}" &
         fi
 
         # Run maximum of X plugin installs in parallel
-        while [ "$(jobs | wc -l)" -ge "${CONCURRENCY_LIMIT}" ]; do
-            echo "  Waiting for batch of ${CONCURRENCY_LIMIT} plugins to install..."
+        while [ "$(jobs | wc -l)" -ge "${concurrencyLimit}" ]; do
+            echo "  Waiting for batch of ${concurrencyLimit} plugins to install..."
             wait
         done
     done
@@ -104,7 +113,6 @@ main() {
 
     export WP_CONTENT_PATH
 
-
     WP_PLUGINS_INSTALL_CONCURRENCY="${WP_PLUGINS_INSTALL_CONCURRENCY:-5}"
     export PLUGIN_LIST WP_PLUGINS_PATH WP_PLUGINS_INSTALL_CONCURRENCY
     taskInstallPlugins "${@}" &
@@ -115,4 +123,4 @@ main() {
     return 0
 }
 
-main "${@}"
\ No newline at end of file
+main "${@}"
diff --git a/rootfs/etc/s6-overlay/s6-rc.d/init-verify-wordpress/run b/rootfs/etc/s6-overlay/s6-rc.d/init-verify-wordpress/run
index e8740a9..cf84173 100755
--- a/rootfs/etc/s6-overlay/s6-rc.d/init-verify-wordpress/run
+++ b/rootfs/etc/s6-overlay/s6-rc.d/init-verify-wordpress/run
@@ -1,4 +1,6 @@
 #!/command/with-contenv bash
+# shellcheck shell=bash
+
 # Designed to replace original, overcomplicated entrypoint script from official wordpress docker repository
 # Why not use already available tools instead?!
 
@@ -6,14 +8,14 @@
 trap scriptExitHandler EXIT
 
 function scriptExitHandler() {
-    LAST_EXIT_CODE=$?
-    if [ "${LAST_EXIT_CODE}" = "0" ]; then
+    local lastExitCode=$?
+    if [ "${lastExitCode}" = "0" ]; then
         echo "Script finished successfully"
-        exit "${LAST_EXIT_CODE}"
+        exit "${lastExitCode}"
     fi
 
     echo "Script finished with an error"
-    exit "${LAST_EXIT_CODE}"
+    exit "${lastExitCode}"
 }
 
 function reportUnhealthy() {
@@ -25,35 +27,38 @@ function main() {
 
     exec > >(while read line; do echo "[init-verify-wordpress] ${line}"; done) 2>&1
 
+    local wpCurrentVersion
+    local wpInstalledVersion
+
     # Removes trailing zero if found
     # This is required due to inconsistencies between WodPress docker image versioning and wp-cli core download
     # If patch version is 0, it is not considered by wp-cli.
-    WP_VERSION=$(echo "${WP_VERSION:?}" | sed --expression='s/.0$//g')
+    wpCurrentVersion=$(echo "${WP_VERSION:?}" | sed --expression='s/.0$//g')
 
-    echo "Verifying 'WordPress ${WP_VERSION}' installation..."
-    WP_INSTALLED_VERSION="$(wp core version)"
+    echo "Verifying 'WordPress ${wpCurrentVersion}' installation..."
+    wpInstalledVersion="$(wp core version)"
 
     set -e
 
     rm -f "/tmp/.wp-unhealthy"
-    if [ -z "${WP_INSTALLED_VERSION}" ]; then
+    if [ -z "${wpInstalledVersion}" ]; then
         echo "Error: WordPress installation does not seem to be present or valid. Continuing anyway..."
 
         reportUnhealthy "WP_NOT_PRESENT"
         return 0
-    elif [ "${WP_INSTALLED_VERSION}" != "${WP_VERSION}" ]; then
+    elif [ "${wpInstalledVersion}" != "${wpCurrentVersion}" ]; then
         echo "WARNING! WordPress version mismatch"
-        echo " Expected version: ${WP_VERSION}"
-        echo " Detected version: ${WP_INSTALLED_VERSION}"
+        echo " Expected version: ${wpCurrentVersion}"
+        echo " Detected version: ${wpInstalledVersion}"
         echo "Seems like WordPress installation got updated outside image scope"
         echo " - This is dangerous as changes will not persist when container is recreated which might lead to inconsistencies between installation and the database."
         echo " - You should assume that recreating the container will render the website inoperable."
-        echo " - Please make sure that you're running image: nlss/wordpress:${WP_VERSION}"
+        echo " - Please make sure that you're running image: nlss/wordpress:${wpCurrentVersion}"
         reportUnhealthy "WP_VERSION_MISMATCH"
         return 0
-    else
-        echo "Identified 'WordPress ${WP_VERSION}'"
     fi
+
+    echo "Identified 'WordPress ${wpCurrentVersion}'"
 }
 
 main "${@}"