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Re: failed grep should cause subshell to exit
From: |
Bob Proulx |
Subject: |
Re: failed grep should cause subshell to exit |
Date: |
Mon, 26 Aug 2013 23:23:41 -0600 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
David Lehmann wrote:
> > Subject: Re: failed grep should cause subshell to exit
> > set -ex
Insert much previous discussion, search the archives, about why set -e
is really a terrible paradigm for the shell. Here is a reference.
http://mywiki.wooledge.org/BashFAQ/105
If you want the shell to exit due to the grep condition then I
recommend coding it explicitly.
if grep foo file; then
echo "foo found"
exit 1
fi
if ! grep foo file; then
echo "foo not found"
exit 1
fi
grep foo file && { echo "foo found"; exit 1 ;}
grep foo file || { echo "foo found"; exit 1 ;}
All are better style (yes, I know it is a matter of taste) than trying
to use 'set -e' as a catch-all. Because 'set -e' is what it is and is
what it has been for decades. That ship sailed years ago.
Bob