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Full Discussion: temporarily suspend crontab
Top Forums Shell Programming and Scripting temporarily suspend crontab Post 302344752 by peterro on Monday 17th of August 2009 01:07:35 PM
Old 08-17-2009
You could...

Code:
0 3 * * * [ ! -f /some/lock_file ] && /path/to/backup/script

The operators would then have a script that would create/remove the lock file (where they have permissions to write). You could also implement that lock file logic into the backup script.

The danger in all of this is that if someone forgets to re-enable the backup script, backups won't be performed. I suppose you could also implement another job that would remove any lock file older than say 3 days.
 

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CRON(8) 						      System Manager's Manual							   CRON(8)

NAME
cron - daemon to execute scheduled commands (Vixie Cron) SYNOPSIS
cron DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'. Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut- ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if such exists). Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has, cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab. SEE ALSO
crontab(1), crontab(5) AUTHOR
Paul Vixie <paul@vix.com> 4th Berkeley Distribution 20 December 1993 CRON(8)
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