diff --git a/deployment_scripts/appimage/run_appimage.sh b/deployment_scripts/appimage/run_appimage.sh
index a903bc034..d7945765a 100644
--- a/deployment_scripts/appimage/run_appimage.sh
+++ b/deployment_scripts/appimage/run_appimage.sh
@@ -1,31 +1,32 @@
 #!/bin/bash
 
-PYTHON_CMD="$APPDIR/opt/python3.7/bin/python3.7"
-DOT_MONKEY=$HOME/.monkey_island/
+PYTHON_CMD="$APPDIR"/opt/python3.7/bin/python3.7
+DOT_MONKEY="$HOME"/.monkey_island/
 
 configure_default_logging() {
-    if [ ! -f $DOT_MONKEY/island_logger_config.json ]; then
-        cp $APPDIR/usr/src/island_logger_config.json $DOT_MONKEY
+    if [ ! -f "$DOT_MONKEY"/island_logger_config.json ]; then
+        cp "$APPDIR"/usr/src/island_logger_config.json "$DOT_MONKEY"
     fi
 }
 
 configure_default_server() {
-    if [ ! -f $DOT_MONKEY/server_config.json ]; then
-        cp $APPDIR/usr/src/monkey_island/cc/server_config.json.standard $DOT_MONKEY/server_config.json
+    if [ ! -f "$DOT_MONKEY"/server_config.json ]; then
+        cp "$APPDIR"/usr/src/monkey_island/cc/server_config.json.standard "$DOT_MONKEY"/server_config.json
     fi
 }
 
 
 
 
-mkdir --mode=0700 --parents $DOT_MONKEY
+# shellcheck disable=SC2174
+mkdir --mode=0700 --parents "$DOT_MONKEY"
 
-DB_DIR=$DOT_MONKEY/db
-mkdir -p $DB_DIR
+DB_DIR="$DOT_MONKEY"/db
+mkdir --parents "$DB_DIR"
 
 configure_default_logging
 configure_default_server
 
-cd $APPDIR/usr/src
-./monkey_island/bin/mongodb/bin/mongod --dbpath $DB_DIR &
-${PYTHON_CMD} ./monkey_island.py --server-config $DOT_MONKEY/server_config.json --logger-config $DOT_MONKEY/island_logger_config.json
+cd "$APPDIR"/usr/src || exit 1
+./monkey_island/bin/mongodb/bin/mongod --dbpath "$DB_DIR" &
+${PYTHON_CMD} ./monkey_island.py --server-config "$DOT_MONKEY"/server_config.json --logger-config "$DOT_MONKEY"/island_logger_config.json