Re: [Nolug] Bash backup script help

doh! sorry;

> "||" executes the second command only if the first one succeeds.

I meant "only if the first one FAILS". Sorry.

B

On 6/23/07, B. Estrade <estrabd@gmail.com> wrote:
> Chris,
>
> You could also use "&&" and "||"
>
> % cmd1 ... && cmd2
> % cmd1 ... || cmd2
>
> "&&" executes the second command only if the one before it returns a
> successful exit status; "||" executes the second command only if the
> first one succeeds.
>
> Real world example; initially the directory 'test' does not exist:
>
> $ cd test 2> /dev/null || (mkdir test && touch test/test.dat)
>
> Or in your case:
>
> #!/bin/sh
> tar .. || exit 1
> echo hi # this will not print if tar fails
>
> B
>
> On 6/22/07, Chris Jones <techmaster@gmail.com> wrote:
> > Thanks, I just figured it out before I checked my email. ;) Works great as
> > far as I can tell, now I've just got to wait till this weekend to try
> > shutting down vmware and backing it up.
> >
> >
> > On 6/22/07, -ray <ray@ops.selu.edu> wrote:
> > > On Fri, 22 Jun 2007, Chris Jones wrote:
> > >
> > > > The functionality I'm wanting to add to it, is after the TAR/GZIP
> > operation,
> > > > I want it to know if the tar command completed successfully or with
> > errors.
> > > > If there were errors, then skip the deletion process. The skipping part
> > is
> > > > easy, but I guess the main thing I'm wondering is how do I test whether
> > the
> > > > tar command ran successfully? I remember in DOS, after you run a
> > command,
> > > > you can test it with "IF ERRORLEVEL=0" and if that returns true then you
> > > > know the command completed successfully. What's the unix equivalent?
> > >
> > > It's similar in unix, using the $? variable. Most commands will exit
> > > non-zero status if there's a problem, and exit zero status if there's no
> > > problem. Based on this, run this code immediately after the tar command:
> > >
> > > if [ $? != 0 ]; then
> > > echo "tar exitted non-zero. Let's not delete"
> > > exit 1
> > > fi
> > >
> > > ray
> > > --
> > >
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> > > Ray DeJean
> > http://www.r-a-y.org
> > > Systems Engineer Southeastern
> > Louisiana University
> > > IBM Certified Specialist AIX Administration, AIX Support
> > >
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> > >
> > > ___________________
> > > Nolug mailing list
> > > nolug@nolug.org
> > >
> >
> >
>
>
> --
> 225.578.1920
> AIM: bz743
> http://www.loni.org/
> estrabd@lsu.edu
> estrabd@gmail.com
>

-- 
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