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Re: Signals ignored by a shell cannot be handled by its sub-shells?
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From: |
Andreas Schwab |
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Subject: |
Re: Signals ignored by a shell cannot be handled by its sub-shells? |
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Date: |
Tue, 12 Jul 2011 09:34:09 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) |
"Clark J. Wang" <dearvoid@gmail.com> writes:
> For example:
>
> [bash-4.2.8] # cat a.sh
> trap '' TERM
> bash b.sh
> [bash-4.2.8] # cat b.sh
> echo "Now in $0 ..."
> trap sig_TERM TERM
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap
"Signals that were ignored on entry to a non-interactive shell cannot be
trapped or reset, although no error need be reported when attempting to
do so. An interactive shell may reset or catch signals ignored on entry."
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."