cron job question (for checking kernel updates)

[Ranjan Maitra]

On Wed, 2 Oct 2013 20:53:52 -0500 inode0 <inode0 at gmail.com> wrote:

> On Wed, Oct 2, 2013 at 10:10 AM, Ranjan Maitra
> <maitra.mbox.ignored at inbox.com> wrote:
> > Hi,
> >
> > I have a cron job running which yum updates all my machines once a day.
> > All of these work fine.
> >
> > I also have a cron job which checks for kernel updates every hour and
> > sends me a message if an updated kernel has been installed. Here is the
> > relevant script:
> >
> > --- begin file called check-kernel.sh in my scripts/yum directory---
> >
> > #!/bin/bash
> 
> export DISPLAY=:0
> 
> > latestkernel=$(rpm -q kernel |tail -n1|sed -e 's/kernel-//')
> >
> > #echo "$latestkernel"
> >
> > if uname -a | grep -qv "$latestkernel"; then
> > notify-send "Kernel UPDATE on ${HOSTNAME}: Running Kernel is $(uname
> > -r) but lat est installed rpm is ${latestkernel}; REBOOT required"
> > fi;
> >
> >
> > --- end file called check-kernel.sh ---

Got it! This works. However, I will also look at the link suggested by
Matthew Miller (and also by Rick later on). I suspect that that is more
general.

Many thanks again for all the help! This is what makes this mailing
list the best!! The link suggested by Matthew Miller
(  http://earlruby.org/2008/08/update-pidgin-status-using-cron/ )
and the points provided by all others provided a lot of explanation and
shed light into things I did not know much about.

Ranjan

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