diff --git a/Makefile b/Makefile
index 2d760c496..c2c9cf49e 100644
--- a/Makefile
+++ b/Makefile
@@ -54,6 +54,8 @@ PHONY += test ci.test test.shell
 ci.test: test.pep8 test.pylint test.unit test.robot
 test:    test.pep8 test.pylint test.unit test.robot test.shell
 test.shell:
+	$(Q)shellcheck -x -s dash \
+		dockerfiles/docker-entrypoint.sh
 	$(Q)shellcheck -x -s bash \
 		utils/brand.env \
 		./manage \
diff --git a/dockerfiles/docker-entrypoint.sh b/dockerfiles/docker-entrypoint.sh
index 1d8edad13..d5c4d5fea 100755
--- a/dockerfiles/docker-entrypoint.sh
+++ b/dockerfiles/docker-entrypoint.sh
@@ -1,62 +1,66 @@
 #!/bin/sh
 
 help() {
-	printf "Command line:\n\n"
-	printf "  -h  Display this help\n"
-	printf "  -d  Dry run to update the configuration files.\n"
-	printf "  -f  Always update on the configuration files (existing files are renamed with the .old suffix)\n"
-	printf "      Without this option, the new configuration files are copied with the .new suffix\n"
-	printf "\nEnvironment variables:\n\n"
-	printf "  INSTANCE_NAME settings.yml : general.instance_name\n"
-	printf "  AUTOCOMPLETE  settings.yml : search.autocomplete\n"
-	printf "  BASE_URL      settings.yml : server.base_url\n"
-	printf "  MORTY_URL     settings.yml : result_proxy.url\n"
-	printf "  MORTY_KEY     settings.yml : result_proxy.key\n"
-	printf "  BIND_ADDRESS  uwsgi bind to the specified TCP socket using HTTP protocol. Default value: \"${DEFAULT_BIND_ADDRESS}\"\n"
-	printf "\nVolume:\n\n"
-	printf "  /etc/searx    the docker entry point copies settings.yml and uwsgi.ini in this directory (see the -f command line option)\n"
-	echo
-	exit 0
+    cat <<EOF
+Command line:
+  -h  Display this help
+  -d  Dry run to update the configuration files.
+  -f  Always update on the configuration files (existing files are renamed with
+      the .old suffix).  Without this option, the new configuration files are
+      copied with the .new suffix
+Environment variables:
+  INSTANCE_NAME settings.yml : general.instance_name
+  AUTOCOMPLETE  settings.yml : search.autocomplete
+  BASE_URL      settings.yml : server.base_url
+  MORTY_URL     settings.yml : result_proxy.url
+  MORTY_KEY     settings.yml : result_proxy.key
+  BIND_ADDRESS  uwsgi bind to the specified TCP socket using HTTP protocol.
+                Default value: ${DEFAULT_BIND_ADDRESS}
+Volume:
+  /etc/searx    the docker entry point copies settings.yml and uwsgi.ini in
+                this directory (see the -f command line option)"
+
+EOF
 }
 
 export DEFAULT_BIND_ADDRESS="0.0.0.0:8080"
-if [ -z "${BIND_ADDRESS}" ]; then
-    export BIND_ADDRESS="${DEFAULT_BIND_ADDRESS}"
-fi
-
-# Parse special command line
-# see docs/admin/installation-docker.rst
-# display the help message without the version
-if [ "$1" = "help" ]; then
-	help
-fi
-
-# Version
-export SEARX_VERSION=$(su searx -c 'python3 -c "import six; import searx.version; six.print_(searx.version.VERSION_STRING)"' 2>/dev/null)
-printf 'searx version %s\n\n' "${SEARX_VERSION}"
+export BIND_ADDRESS="${BIND_ADDRESS:-${DEFAULT_BIND_ADDRESS}}"
 
 # Parse command line
 FORCE_CONF_UPDATE=0
 DRY_RUN=0
+
 while getopts "fdh" option
 do
     case $option in
-	f)
-	    FORCE_CONF_UPDATE=1
-	    ;;
-	d)
-	    DRY_RUN=1
-	    ;;
-	h)
-		help
+
+        f) FORCE_CONF_UPDATE=1 ;;
+        d) DRY_RUN=1 ;;
+
+        h)
+            help
+            exit 0
+            ;;
+        *)
+            echo "unknow option ${option}"
+            exit 42
+            ;;
     esac
 done
 
+get_searx_version(){
+    su searx -c \
+       'python3 -c "import six; import searx.version; six.print_(searx.version.VERSION_STRING)"' \
+       2>/dev/null
+}
+
+SEARX_VERSION="$(get_searx_version)"
+export SEARX_VERSION
+echo "searx version ${SEARX_VERSION}"
+
 # helpers to update the configuration files
 patch_uwsgi_settings() {
     CONF="$1"
-
-    # Nothing
 }
 
 patch_searx_settings() {
@@ -74,10 +78,11 @@ patch_searx_settings() {
        "${CONF}"
 
     # Morty configuration
-    if [ ! -z "${MORTY_KEY}" -a ! -z "${MORTY_URL}" ]; then
-	sed -i -e "s/image_proxy : False/image_proxy : True/g" \
-	    "${CONF}"
-	cat >> "${CONF}" <<-EOF
+
+    if [ -n "${MORTY_KEY}" ] && [ -n "${MORTY_URL}" ]; then
+        sed -i -e "s/image_proxy : False/image_proxy : True/g" \
+            "${CONF}"
+        cat >> "${CONF}" <<-EOF
 
 # Morty configuration
 result_proxy:
@@ -96,35 +101,35 @@ update_conf() {
     PATCH_REF_CONF="$4"
 
     if [ -f "${CONF}" ]; then
-	if [ "${REF_CONF}" -nt "${CONF}" ]; then
-	    # There is a new version
-	    if [ $FORCE_CONF_UPDATE -ne 0 ]; then
-		# Replace the current configuration
-		printf '⚠️  Automaticaly update %s to the new version\n' "${CONF}"
-		if [ ! -f "${OLD_CONF}" ]; then
-		    printf 'The previous configuration is saved to %s\n' "${OLD_CONF}"
-		    mv "${CONF}" "${OLD_CONF}"
-		fi
-		cp "${REF_CONF}" "${CONF}"
-		$PATCH_REF_CONF "${CONF}"
-	    else
-		# Keep the current configuration
-		printf '⚠️  Check new version %s to make sure searx is working properly\n' "${NEW_CONF}"
-		cp "${REF_CONF}" "${NEW_CONF}"
-		$PATCH_REF_CONF "${NEW_CONF}"
-	    fi
-	else
-	    printf 'Use existing %s\n' "${CONF}"
-	fi
+        if [ "${REF_CONF}" -nt "${CONF}" ]; then
+            # There is a new version
+            if [ "$FORCE_CONF_UPDATE" -ne 0 ]; then
+                # Replace the current configuration
+                printf '⚠️  Automaticaly update %s to the new version\n' "${CONF}"
+                if [ ! -f "${OLD_CONF}" ]; then
+                    printf 'The previous configuration is saved to %s\n' "${OLD_CONF}"
+                    mv "${CONF}" "${OLD_CONF}"
+                fi
+                cp "${REF_CONF}" "${CONF}"
+                $PATCH_REF_CONF "${CONF}"
+            else
+                # Keep the current configuration
+                printf '⚠️  Check new version %s to make sure searx is working properly\n' "${NEW_CONF}"
+                cp "${REF_CONF}" "${NEW_CONF}"
+                $PATCH_REF_CONF "${NEW_CONF}"
+            fi
+        else
+            printf 'Use existing %s\n' "${CONF}"
+        fi
     else
-	printf 'Create %s\n' "${CONF}"
-	cp "${REF_CONF}" "${CONF}"
-	$PATCH_REF_CONF "${CONF}"
+        printf 'Create %s\n' "${CONF}"
+        cp "${REF_CONF}" "${CONF}"
+        $PATCH_REF_CONF "${CONF}"
     fi
 }
 
 # make sure there are uwsgi settings
-update_conf ${FORCE_CONF_UPDATE} "${UWSGI_SETTINGS_PATH}" "/usr/local/searx/dockerfiles/uwsgi.ini" "patch_uwsgi_settings"
+update_conf "${FORCE_CONF_UPDATE}" "${UWSGI_SETTINGS_PATH}" "/usr/local/searx/dockerfiles/uwsgi.ini" "patch_uwsgi_settings"
 
 # make sure there are searx settings
 update_conf "${FORCE_CONF_UPDATE}" "${SEARX_SETTINGS_PATH}" "/usr/local/searx/searx/settings.yml" "patch_searx_settings"
@@ -135,7 +140,6 @@ if [ $DRY_RUN -eq 1 ]; then
     exit
 fi
 
-#
 touch /var/run/uwsgi-logrotate
 chown -R searx:searx /var/log/uwsgi /var/run/uwsgi-logrotate
 unset MORTY_KEY
diff --git a/docs/admin/installation-docker.rst b/docs/admin/installation-docker.rst
index 120c9cb08..7e40546c6 100644
--- a/docs/admin/installation-docker.rst
+++ b/docs/admin/installation-docker.rst
@@ -39,7 +39,7 @@ Command line
 
     docker run --rm -it searxng/searxng -h
 
-.. program-output:: ../dockerfiles/docker-entrypoint.sh help
+.. program-output:: ../dockerfiles/docker-entrypoint.sh -h
 
 
 Build the image