On 11/23/2015 12:21 PM, Tom Lane wrote:
>0 20 * * * db_backup.sh 1> /dev/null 2>&1 | mail -s "backup cron"
>myem...@comp.com
>I am re-directing stderr to stdout and then sending that to email.
Uh, read it again: you're redirecting stdout to /dev/null and then
redirecting stderr to go where stdout goes. So all output is
going to the bit bucket, not the pipe.
the 2>&1 notation is not completely intuitive.... if you want to
redirect stderr to the pipe and bitbucket stdout, do it in the opposite
order.
.... 2>&1 1> /dev/null | ...
that sends stderr to the file that stdout was assigned, and sends stdout
to the bit bucket... note specifically that redirecting stdout won't
affect the file stderr is being sent.
--
john r pierce, recycling bits in santa cruz
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