Re: [PLUG] Bash I/O redirection

[Julien Vehent <julien@linuxwall.info>]

On Wed, 31 Aug 2011 13:56:45 -0400, JP Vossen wrote:
> > Date: Wed, 31 Aug 2011 11:33:31 -0400
> > From: Julien Vehent<julien@linuxwall.info>
> >
> > I have this bash script that does an oracle backup (launched via
> > crontab), and I'd like to redirect the output of the script to a 
> > file.
> > The classic ways to do it would be:
> >      * use a wrapper script (that requires an additional script...)
> >      * call the script with '>' in the cron line (make my cron line 
> > ugly)
> >      * inside the script, put a ">>" after each command (berk !)
> >
> > My question is: would there be a way to put a global redirection at 
> > the
> > beginning of the script ?
>
> Yes.  You want:
>
> _bash Cookbook_ Recipe 15.12 Redirecting Output for the Life of a 
> Script
>
>
> http://books.google.com/books?id=Qu6H8fnAvGoC&pg=PA342&lpg=PA342&dq=%22redirecting+output+for+the+life+of+a+script%22&source=bl&ots=CheSaesF9-&sig=q_w1PceCFvxmJFmnNq1KrAUx7gM&hl=en&ei=p3ReTu-wK8Pn0QHWu_ndAg&sa=X&oi=book_result&ct=result&resnum=4&ved=0CCwQ6AEwAw
>
> Short version (changed from the book's STDERR to STDOUT):
>
> # Optional, save the "old" STDOUT
> exec 3>&1
>
> # Redirect STDOUT to file
> exec 1 > /path/to/file
>
> # script goes here
>
> # Optional, revert change & close FH3
> exec 1>&3-


That's the syntax I was looking for. Thanks JP and Alan.



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