crontab suggestion needed

vicky007aggrwal · 09-20-2012, 12:58 PM

Hi guys,

Kindly assist by suggesting what will be the correct crontab entry for the following scenario:-

I want to execute a script on coming 23 Sep (sunday) & after that i want to run the script every fortnight(14 days) on sunday at 5:30 am

I am not able to figure it out,,,, pls suggest

Thanks for your help

TheMadIndian · 09-20-2012, 01:08 PM

Quote:

Originally Posted by vicky007aggrwal

Hi guys,

Kindly assist by suggesting what will be the correct crontab entry for the following scenario:-

I want to execute a script on coming 23 Sep (sunday) & after that i want to run the script every fortnight(14 days) on sunday at 5:30 am

I am not able to figure it out,,,, pls suggest

Thanks for your help

Post #3 or #4 in this link may help
http://www.linuxquestions.org/questi...4-days-725887/

vicky007aggrwal · 09-20-2012, 01:33 PM

Thanks TheMadIndian for your prompt response.

But i didnt understand much from your provided link, it will be a great help if you can elaborate a bit

Thanks

TheMadIndian · 09-20-2012, 01:37 PM

Quote:

Originally Posted by vicky007aggrwal

Thanks TheMadIndian for your prompt response.

But i didnt understand much from your provided link, it will be a great help if you can elaborate a bit

Thanks

Those posts show how to have something execute every 14 days, isn't that what you were looking for?

hean01 · 09-20-2012, 02:37 PM

As i understand you have a start date were something should start to execute every forthnight,
there are several ways to do this, either you create a script that updates your crontab to
run another script ever forthnight, the initial script can be sceduled with at command.

Another approach is to not touch the crontab at all and only use at command, something
in line with script below called myscript.sh, and the you have a myaction.sh that does
what you want to be doing evert forthnight.

Regards,

Henrik Andersson

Code:

#!/bin/bash
if [$# -eq 0]; then
  at 8am Sep 23 myscript.sh 1
else
  myaction.sh
  at 5:30am +14 days myscript.sh 1
fi

vicky007aggrwal · 09-20-2012, 11:03 PM

Thanks hen01 for responding.

But i want to use cron for scheduling my script first on 23 sep then after 23 sep i want to run every 14th day.

I believe using AT command we can schedule a job only once ..but i want to run my script whole year

Please suggeat

hean01 · 09-21-2012, 01:05 AM

As you can see in my script it does reschedule it self, it will work the way you want,
run the script without arguments it will rescedule itself with argument to run at 23 sep,
when executed with argument the script branches and execute myaction.sh and then
reschedule itself to run in 14 days.