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Re: Signals ignored by a shell cannot be handled by its sub-shells?
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From: |
Clark J. Wang |
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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 16:59:02 +0800 |
On Tue, Jul 12, 2011 at 3:34 PM, Andreas Schwab <schwab@linux-m68k.org>wrote:
> "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."
>
>
Thanks and I also found that in Bash's man page.
> 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."
>