To control program in shell

control_program.sh

#!/bin/sh
# control_program.sh
# To control program in shell
# License: MIT (https://ncurl.xyz/s/RD0Yl5fSg)
# https://gist.github.com/supersonictw/007bfb79d6c7bbfc7658549d3c52ab60

case $2 in
    "start" )
        if [ -f "/tmp/.cp_lock-$1" ]; then
            echo "The pidfile already exists."
        else
            nohup $1 2> /dev/null &
            echo $! > /tmp/.cp_lock-$1
        fi
    ;;
    "stop" )
        if [ -f "/tmp/.cp_lock-$1" ]; then
            kill `cat /tmp/.cp_lock-$1`
            rm /tmp/.cp_lock-$1
        else
            echo "The pidfile does not exists."
        fi
    ;;
    * )
        echo "Usage: sh $0 program (start|stop)" 
    ;;
esac