Hello 

When I run pipeline with sh to kill a process on linux server, but when I run "ps -ef | grep XXX" this process it is still there.

Could you help to guide me how to make it work please?

For example:
node('my_linux_server'){
   stage('Stop Jenkins'){
        echo "Stop Jenkins Server " + env.JENKINS_SERVER_NAME
        sh 'kill `pgrep -f ${JENKINS_SERVER_NAME}`'
        sh 'ps -ef | grep -v grep | grep $JENKINS_SERVER_NAME'
   }
}

actually, the process is doesn't exsit when run "kill `pgrep -f ${JENKINS_SERVER_NAME}`", the second command "ps -ef | grep -v grep | grep $JENKINS_SERVER_NAME" shouldn't return any thing, but it did.

So could you help to have a look it if it is a issue or something wrong with my commands please?