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From: "Anthony Heading" <anthony@ajrh.net>
To: "Mikael Magnusson" <mikachu@gmail.com>
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Subject: Re: 4.3.11 TRAPEXIT() on cygwin
Date: Mon, 10 Jan 2011 21:54:29 -0500

On Tue, 11 Jan 2011 02:50 +0100, "Mikael Magnusson" <mikachu@gmail.com>
wrote:
> > echo $( trap 'echo exiting' EXIT)
> >
> > or similar substitutions.  That's quite clearly a subshell entering to
> > the same extent a ( ... ) is.
> 
> How is that different from what you wrote?

Well, the examples you quote are traps set within a subshell, which may
or may not propagate higher.

My problem is that the subshell is inheriting the parent trap action.

That seems obviously different, and POSIX seems pretty clear:

    When a subshell is entered, traps that are not being ignored shall
    be set to the default actions, except in the case of a command
    substitution containing only a single trap command, when the traps
    need not be altered.

Anthony