Excerpts from linux-config: 9-Dec-98 pipe behavior differs: Linu.. Scott
McDermott@frontier (780*)
> I cannot:
> jobs | grep pattern
I'm guessing that Linux is starting the 'jobs' call in a new process,
because it's the first process in a pipeline. I know the csh on AIX
behaves in this fashion, though I'm somewhat confused why bash behavior
differs between the platforms. The ksh and sh shells on AIX don't
behave this way.
Here's the csh example on AIX -- note the 'jobs | grep sleep' output is empty:
% sleep 20 &
[1] 39314
% jobs
[1] + Running sleep 20
% jobs | grep sleep
% jobs > /tmp/xyz; grep sleep /tmp/xyz
[1] + Running sleep 20
%
[1] Done sleep 20
For balance, here's the sh version on AIX:
% /bin/sh
$ sleep 20 &
[1] 39584
$ jobs
[1] + Running sleep 20 &
$ jobs | grep sleep
[1] + Running sleep 20 &
$
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