Re: [PATCH] Improved LINENO support

[Eric Blake <eblake@redhat.com>]

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On 11/12/2010 11:17 AM, Harald van Dijk wrote:
>   (
>     :
>     :
>     :
>     :
>     :
>   ) >test-$LINENO
> 
> should write to file test-1, not test-7, even though the only word is on
> line 7. bash gets this wrong, pdksh gets this almost right.

Umm - there was more than one word in that example (each : in the
subshell is a word).  But I agree that the subshell command itself
started on line 1, but the word containing $LINENO is on line 7.

There are _so many_ variations on what this example would do that it's
hard to say that any one version is definitively correct.  In general,
the standard tends to favor the ksh93 interpretation of things; but on
your example, it touches the file test-6 (not test-7 nor test-1).

All I can see in the standard is:

"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."

with no hint as to whether LINENO auto-increments over the number of
newlines encountered while parsing that command.

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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