[CentOS] Runing a script under cron. Append stdout and, stderr to a log file, propagate stderr back to cron for email, reporting

Sun Sep 23 14:13:34 UTC 2007
David G. Miller <dave at davenjudy.org>

"Alexander Georgiev" <alexander.georgiev at gmail.com> wrote:

> I want to run a rsync-ing script in cron, generating a very verbose
> -vv rsync log in a log file. The log file should combine both stderr
> and stdin, which is easy:
>      backup.sh >>/var/log/backup.log 2>&1
> However, I would like to propagate only stderr to cron - in case there
> has been an error, cron will mail me the assembled stderr output.
If you just want STDERR to get mailed to root (or wherever you specify), 
remove the "2>$1" from your cron entry.  This is what instructs the 
shell to combine STDOUT with STDERR.  Your cron entry should look like:

backup.sh >>/var/log/backup.log >> /var/log/backup.log

to append STDOUT output to backup.log.  cron automatically mails any 
output from programs.


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