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

[Eric Blake (cygwin)]

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, and I see no reason why bash should not fully 
comply with the User Portability Utilities option (which also includes 
things like fc, that bash also supports):
http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_05_03

LINENO
    Set by the shell to a decimal number representing the current 
sequential line number (numbered starting with 1) within a script or 
function before it executes each command. If the user unsets or resets 
LINENO , the variable may lose its special meaning for the life of the 
shell. If the shell is not currently executing a script or function, the 
value of LINENO is unspecified. This volume of POSIX.1-2008 specifies 
the effects of the variable only for systems supporting the User 
Portability Utilities option.

--
Eric Blake
volunteer cygwin package maintainer

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