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how to cancel a cronjob if the cronjob still running

 
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Top Forums UNIX for Dummies Questions & Answers how to cancel a cronjob if the cronjob still running
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Old 08-18-2010
Could have one daily cron which executes a script. Within the script loop with a 60-second delay after each succesful job completion.
Within the loop within the script also test for a "stop" flag file and have another cron to set the "stop" flag file at the end of the day. Remember to delete the "stop" flag file just before exiting the script.

Btw. A cron running every minute will create at least 3x3,600=10,800 entries in the cron log per day. If the cron job produces any untrapped output it will also create 3,600 emails per day.
 
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LEARN ABOUT REDHAT

cron

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)