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Full Discussion: Conditional Cron
Top Forums Shell Programming and Scripting Conditional Cron Post 302112795 by Perderabo on Friday 30th of March 2007 10:35:37 AM
Old 03-30-2007
First, the backslash is required. From the crontab man page:
Quote:
The sixth field of a line in a crontab file is a string that is executed by the shell at the specified times. A percent character in this field (unless escaped by \) is translated to a NEWLINE character.
Some versions of cron are smart enough to remove that blackslash prior to passing it to the shell. Others just leave it there. So the shell will see:
[ \30 -eq 30 ]
Most shells will get that right but some versions of the bourne shell will not. You are probably using Solaris which has both behaviors. My advice is to put shell scripting into a shell script which is executed by a modern shell. If you must get this to work, use eval with the date command
Code:
34 13 * * * [ `eval date +'\%d'` -eq `cal | grep -v "^$" | tail -1 | awk '{print $NF-1}'` ] && /export/myshell.sh

 

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apticron(1)						      General Commands Manual						       apticron(1)

NAME
apticron - Generate a mail listing packages which are pending an upgrade SYNOPSIS
apticron [--cron] DESCRIPTION
apticron is a shell script which generates a mail with a list of all packages currently pending an upgrade, as well as summary of changes - using apt-listchanges - to a configurable Email address. apticron is mainly intended for automatic notification of pending security updates but can also be used in many other situations where timely updates are necessary. The --cron option is only meant to be used when invoked by cron in order to run no more than once a day. FILES
/etc/apticron/apticron.conf Configuration file, Email address to mail and profile for use with apt-listchanges are configurable. /etc/cron.d/apticron Cron job for executing apticron daily. /etc/cron.daily/apticron Fallback cron script for executing apticron (if no crond running or system down at designated time). /var/lib/misc/apticron.cron Time stamp file used by apticron when invoked with --cron option. SEE ALSO
apt-get(8), apt-listchanges(1), cron(8) AUTHOR
Apticron was initially developed by Colm MacCarthaigh <colm.maccarthaigh@heanet.ie> with contributions from Marc Sherman <msherman@projec- tile.ca>. Since 2006 it is maintained and improved by Tiago Bortoletto Vaz <tiago@debian.org>. apticron(1)
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