04-29-2002
In a korn shell you can do the following:
Add to your script a lock condition.
Example:
while [ `ps -ef |grep your_script_name |grep -v grep |wc -l ` -gt 1 ]
do
echo "waiting to the end of the previous instance"
sleep 10
done
#your code
.....
Regards. Hugo.
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LEARN ABOUT DEBIAN
apticron
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)