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Top Forums Shell Programming and Scripting comment out a cron job as part of a script Post 302294233 by 22blaze on Wednesday 4th of March 2009 09:45:34 PM
Old 03-04-2009
comment out a cron job as part of a script

Greetings,
I am creating a ksh script to automate the installation of a utility on many servers.
As part of this install, I want to check for a job in root's crontab.
If the job exists, I need to comment it out.
I know I will need to copy off the crontab then read it back in, but I am struggling on commenting the job out while maintaining the integrity of the crontab.
The job will have the same path, so this is a constant to check for.
The crontab entry might not reside on the same line for each server.
Any tips would be appreciated.
Thanks
 

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ATRUN(8)						    BSD System Manager's Manual 						  ATRUN(8)

NAME
atrun -- run jobs queued for later execution SYNOPSIS
atrun [-l load_avg] [-d] DESCRIPTION
Atrun runs jobs queued by at(1). Root's crontab(5) file /etc/crontab has to contain the line */5 * * * * root /usr/libexec/atrun so that atrun gets invoked every five minutes. At every invocation, atrun will start all the jobs in the lowercase queues whose start time has elapsed. In addition, if the load average over the last minute was less than the specified limit then a maximum of one batch job (denoted by the uppercase queues) is started. Before starting a job, atrun will check the status of its owner's account with pam(3) and refuse to run the job if the account is unavail- able, e.g., locked out or expired. OPTIONS
-l load_avg Specify a limiting load factor, over which batch jobs should not be run, instead of the default of 1.5 * number of active CPUs. -d Debug; print error messages to standard error instead of using syslog(3). WARNINGS
For atrun to work, you have to start up a cron(8) daemon. FILES
/etc/pam.d/atrun pam.conf(5) configuration file for atrun /var/at/jobs Directory containing job files /var/at/spool Directory containing output spool files SEE ALSO
at(1), crontab(1), pam(3), syslog(3), crontab(5), pam.conf(5), cron(8) BUGS
The functionality of atrun should be merged into cron(8). BSD
October 30, 2012 BSD
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