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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_FILE=./$(hostname)-lock (set -C; : > $LOCK_FILE) 2> /dev/null if [ $? != "0" ]; then echo "already running (lock file exists); exiting..." exit 1 fi trap 'rm $LOCK_FILE' INT TERM EXIT

when I run it for the first time I get the message already running as if the file already existed.

Perhaps I'm missing something

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  • read on flock usage in bash scripts. Commented May 7, 2014 at 22:06

1 Answer 1

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#!/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 :)

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