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Re: trap 'echo "trap exit on ${LINENO}"' EXIT -> wrong linenumber


From: Chet Ramey
Subject: Re: trap 'echo "trap exit on ${LINENO}"' EXIT -> wrong linenumber
Date: Sat, 18 Sep 2010 14:18:44 -0400
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.8) Gecko/20100802 Lightning/1.0b2 Thunderbird/3.1.2

On 9/18/10 12:57 PM, Eric Blake (cygwin) wrote:
> On 09/17/2010 06:37 PM, Chet Ramey wrote:
>> I guess you could make a case to not reset $LINENO for the exit trap
>> due to this sentence in Posix (though $LINENO is not Posix):
> 
> LINENO may be optional in the bare minimum POSIX compliance, but it is
> certainly specified

You're right.  I guess the real question is what happens to LINENO
when `eval' is executed.  bash, ksh93, and zsh do different things,
and dash doesn't support LINENO at all.  Posix says that trap actions
are processed as if executed by eval.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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