$LINENO within functions

[Kostik Belousov]

On Fri, May 30, 2008 at 09:12:42PM +0300, Kostik Belousov wrote:
> On Fri, May 30, 2008 at 07:27:12PM +0200, Stefan Farfeleder wrote:
> > Hi,
> > 
> > SUSv3 says the following about $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 IEEE Std 1003.1-2001
> > specifies the effects of the variable only for systems supporting the
> > User Portability Utilities option."
> > 
> > My initial interpretation of "or function" was that it means $LINENO
> > within a function should be relative to the function's beginning line.
> > Now I'm not so sure anymore.  Bash release 2.05b changed the expansion
> > of $LINENO within functions to absolute numbering, stating this is
> > required by POSIX.  But then I wonder about the meaning of "or
> > function".  Does it mean functions in interactive scripts?  Because for
> > functions in shell scripts the mentioning of both "script" and
> > "function" seems redundant.
> 
> I do not know whether you need this data, but ksh93 and pdksh exhibit
> the same behaviour as bash. For the rev. 1.1 of lineno.0, I got
> 
> 2
> 3
> 6
> 7
> 12
> 13
> foo
> foo
> 2
> 
> On the other hand, zsh produces
> 
> 2
> 3
> 1
> 2
> 12
> 13
> foo
> foo
> 2

Oh, and /usr/xpg4/bin/sh on the fully patches Solaris 10 output is identical
with the zsh one.
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