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Re: Command substitution and errexit

From: Nikolai Kondrashov
Subject: Re: Command substitution and errexit
Date: Tue, 16 Oct 2012 15:28:37 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.7) Gecko/20120922 Icedove/10.0.7

On 10/16/2012 03:16 PM, Greg Wooledge wrote:
On Mon, Oct 15, 2012 at 08:08:10PM -0400, DJ Mills wrote:
done<  <(set -o)

Huh... that's interesting.  I wouldn't have expected it, but it turns
out you don't "lose" the value of errexit in a process substitution the
way you do in a command substitution.

imadev:~$ bash -c 'set -e; x=$(set +o); grep errexit<<<"$x"'
set +o errexit
imadev:~$ bash -c 'set -e; grep errexit<(set +o)'
set -o errexit

So, assuming Nikolai still wants to go with his current design, I guess
he could use code like this:

read -rd '' settings<  <(set +o)
eval "$settings"

That would do nicely, thanks Greg!

However, is this as supposed to be? Because, if it's not, or there is no
certainty, I'd rather not use it.



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