Which options can i use in "flock" to stop multiple script executions.

varma6009 · 12-19-2014, 07:45 AM

Actually in my script im using as below:
(
flock -x -w 300 200 || ( echo "[ERROR] Could not reserve lock" && exit 1 )

# My code(Script to take backup)

) 200>/tmp/myscript.lock

In my cron i have written like it should execute for every one hour. So, when my script is running and taking some time to execute, after some time it is allowing cron to run script after an hour even the old script did not complete execution.
So, is there any way that after one hour if the script doesn't complete, it should wait until it is completed and then run another script.

NevemTeve · 12-19-2014, 08:58 AM

And what error [message] did you get?

(Note: please use [code] and [/code] tags when quoting code.)

varma6009 · 12-19-2014, 09:03 AM

I didn't get any error but when i logged into server and checked process there are 24 process(script was being executed every hour even though the last script did not complete execution) running

NevemTeve · 12-19-2014, 09:18 AM

It should be { echo "[ERROR] Could not reserve lock"; exit 1; }

another example:

Code:

#!/bin/sh

exec 9>/tmp/locktest.lock	# 9 = max value for dash

flock -w 10 9 || { echo No lock; exit; }

echo 'Before wait'
sleep 60
echo 'After wait'

flock -u 9