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Top Forums Shell Programming and Scripting Execute a shell script after a particular command is run Post 302333654 by TonyFullerMalv on Monday 13th of July 2009 05:59:21 PM
Old 07-13-2009
If you stored the sum value of the output from crontab -l somewhere then you could run a conjob to compare the actual sum value from crontab -l with the stored one and run something if they were different.

Manual setup:
Code:
# crontab -l | sum > /root/crontab-l.sum

Script to run from root cron:
Code:
LIVECRONSUM=`crontab -l | sum`
STOREDCRONSUM=`cat /root/crontab-l.sum`
if [ ${LIVECRONSUM} -ne ${STOREDCRONSUM} ]; then
  #run something
  logger -p daemon.notice "The root user crontab has changed!"
  # updated stored value so that the above only runs once
  crontab -l | sum > /root/crontab-l.sum
fi

 

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bcrontab(1)						      General Commands Manual						       bcrontab(1)

NAME
bcrontab - Manage users crontab files SYNOPSIS
bcrontab [ -u user ] file bcrontab [ -u user ] { -l | -r | -e } DESCRIPTION
bcrontab interfaces with the bcron-spool daemon to manage crontab files in the privileged spool directory. OPTIONS
-u user Tell bcron-spool that we are acting on behalf of the named user. bcron-spool will only accept the username if bcrontab is running as either root or the same user ID as the named user. -l List the cronab crontab to standard output. -r Remove the user's crontab. -e Edit the current crontab. ENVIRONMENT
VISUAL If this is set, it is used as the editor to invoke to edit a crontab. EDITOR If $VISUAL is not set and this is, it is used as the editor to invoke to edit a crontab. If neither are set, /bin/vi is used. BCRON_SOCKET The path to the named socket used to communicate with bcron-spool. Defaults to /var/run/bcron-spool. LOGNAME USER These two variables are used, in order, to determine the user name invoking the program. One must be set if the -u option is not used. FILES
bcrontab tries to writes a temporary file into the current directory, and then into /tmp if that fails, in order to edit the current crontab. SEE ALSO
bcron-spool(8), crontab(5) AUTHOR
Bruce Guenter <bruceg@em.ca> bcrontab(1)
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