create a lock file in bash to avoid duplicate execution

Question

I\'m not very good on bash I\'ve been modifying a code to create a lock file so a cron don\'t execute a second time if the first process hasn\'t finish.

LOCK         


        

Answer 1

#!/bin/sh

(
  # Wait for lock on /tmp/lock

  flock -x -w 10 200 || exit 127 # you can use or not use -w

  #your stuff here

) 200> /tmp/lock

check man page flock.

This is the tool for you. And it comes with example in man page :)