Please help me find the four problems with this script. Below is an example output of the script.

tmoyer2@itis-3246:~/scripting-2$ ./4-case.sh usage: ./4-case.sh  tmoyer2@itis-3246:~/scripting-2$ ./4-case.sh start Starting process tmoyer2@itis-3246:~/scripting-2$ echo $? 0 tmoyer2@itis-3246:~/scripting-2$ ./4-case.sh stop Stopping process tmoyer2@itis-3246:~/scripting-2$ ./4-case.sh restart Restarting process tmoyer2@itis-3246:~/scripting-2$ ./4-case.sh reload Reloading process tmoyer2@itis-3246:~/scripting-2$ ./4-case.sh magic Unrecognized command magic tmoyer2@itis-3246:~/scripting-2$ echo $? 255

Script:

#!/bin/bash

if [[ -z $1 ]] then echo "usage: $0 " exit -1 fi

case "$1" in 'start' ) echo "Starting process" ;; 'stop' ) echo "Stopping process" 'restart' ) echo "Restarting process" ;; 'reload' ) echo "Reloading process" done exit 0