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Date: Wed, 23 Apr 2008 15:35:11 +0200
From: Tomasz Chmielewski <mangoo@wpkg.org>
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Subject: Re: [linux-lvm] Simple scripts for use in automated backups?
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To: LVM general discussion and development <linux-lvm@redhat.com>

Charles Marcus schrieb:
> Hello again,
> 
> Sorry to flood the list with newbie questions... if there is a better 
> list for things like this, please let me know...
> 
> I'm still fairly new to linux (coming from windows world), and enjoying 
> the freedom, but as far as scripting goes - well, to call me a noob is 
> being kind...
> 
> Would any kind souls be willing to share some basic scripts that can be 
> used to activate a snapshot, then 'do x' (this would be my rsnapshot 
> command), then release the snapshot? The part that I don't have a clue 
> about is how to check for errors - ie, did the snapshot activate ok? Did 
> it release ok?...

*Usually*, a command exits with code 0 if it finishes with a success.

In bash, you can check the exit code with $? variable.

So:


lvmcommand --option1 --option2

if [ $? -eq 0 ] ; then
    do_this
else
    do_that
fi