Create a Lock file in shell script to avoid multiple executions of the same script.

This script shows how to lock a file using a shell script and this can be useful to avoid multiple executions of the same script.

#!/bin/bash

set -e

(

        /usr/bin/flock -n 200

        # do stuff

         

) 200>fileToLock

With set -e execution ends if flock commands fails to lock the file.