Demand exactly 1 argument

update-app.sh

@@ -4,14 +4,14 @@
 set -e
 
 # check if unprivileged
-if [ $(id -u) -eq 0]
+if [ $(id -u) -eq 0 ]
   then
 	echo "Please do not run this script as root."
 	exit 0
 fi
 
 # check file permissions
-if [[ -w ~/wp-content/plugins ]]
+if [ -w ~/wp-content/plugins ]
   then
 	echo "Missing file permissions. To fix this, run this command as root:"
 	echo "  chown $USER /home/$USER/wp-content/plugins -R"
@@ -19,7 +19,7 @@ if [[ -w ~/wp-content/plugins ]]
 fi
 
 # we need at least one argument
-if [ $# -eq 0 ]
+if [ ! $# -eq 1 ]
   then
 	echo "usage: ./update-app.sh \$app"
 	exit 0