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Full Discussion: How to determine the script is called from CRON?
Top Forums Shell Programming and Scripting How to determine the script is called from CRON? Post 75014 by Perderabo on Tuesday 14th of June 2005 09:26:42 PM
Old 06-14-2005
There can be a lot of processes named cron. You are picking one at random and attempting to see if it's your parent. In your crontab entry do something that you won't do interactively. Like:
55 18 * * * /path/to/script runfromcron
Then just check $1.

Code:
if [[ $1 = runfromcron ]] ; then
      echo running from cron
      shift
else
      echo not running from cron
fi

This faster, easier, and you have a way to more easily test the script's operation.
 

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LEARN ABOUT DEBIAN

cron-apt

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

NAME

       cron-apt -- program to update the system using apt-get

SYNOPSIS

       cron-apt [configfile]

DESCRIPTION

       This manual page documents briefly the cron-apt command.

       cron-apt is a program that uses the information in /etc/cron-apt/action.d/ as arguments to apt-get line by line in file order.

OPTIONS

       These  programs	follow	the  usual  GNU  command  line	syntax, with long options starting with two dashes (`-').  A summary of options is
       included below.	For a complete description, see the Info files.

		 --help
		 Show summary of options.

CONFIGURATION

       Configuration can be done by editing /etc/cron-apt/config and by adding rules to /etc/cron-apt/action.d/ The variables that you can set	in
       /etc/cron-apt/config is documented in the configuration example in /usr/share/doc/cron-apt/examples/config

       From version 0.5.0 the optional FILTERCTRLM attribute is deprecated.

SEE ALSO

       apt-get (1)

       aptitude (1)

AUTHOR

       This  manual  page was written by Ola Lundqvist ola@inguza.com for the Debian GNU/Linux system (but may be used by others).  This manual is
       free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software
       Foundation; either version 2 of the License, or (at your option) any later version.

																       CRON-APT(8)
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