bash script to stop/start/status a process. includes waiting for process to stop

gistfile1.txt

#!/bin/bash

pid_file="/path/to/pidfile"
command="./t2.sh &"

function start {
   echo "starting..."
   $command
   pid=$!
   echo $pid > $pid_file
   echo "process id is $pid"
}

function stop {
   echo "stopping..."
   pid=$(cat "$pid_file")
   kill "$pid"
   while [ "$(isRunning)" == "true" ]
   do
      echo "waiting for process $pid to stop..."
      sleep 2
   done
   rm $pid_file
   echo "process $pid stopped"
}


function isRunning {
        if [ ! -e "$pid_file" ]
        then
            echo "false"
        else
           pid=$(cat "$pid_file")
           count=$(ps -lfhp $pid|wc -l)

           if [ "$count" == 1 ]
           then
             echo "true"
           else
             echo "false"
           fi
       fi
}

case "$1" in
'start')
        if [ "$(isRunning)" == "false" ]
        then
            start
        else
            echo "process already running"
        fi
        ;;

'stop')
        if [ ! -e "$pid_file" ]
        then
            echo "no PID file found, exiting..."
            exit 1
        fi

        if [ "$(isRunning)" == "true" ]
        then
            stop
        else
            echo "$(isRunning)"
            echo "process is not running"
        fi
        ;;
'status')
        if [ "$(isRunning)" == "true" ]
        then
            echo "process is running"
        else
            echo "process is not running"
        fi
        ;;
*)
        echo "Usage: logstash_apache_logs { start | stop | status }"
        ;;
esac
exit 0