From owner-freebsd-hackers  Mon Mar  6 14:15: 1 2000
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Date: Mon, 6 Mar 2000 17:13:30 -0500
From: Chet Ramey <chet@nike.ins.cwru.edu>
To: iedowse@maths.tcd.ie
Subject: Re: empty lists in for
Cc: imp@village.org, jhix@mindspring.com, Doug@gorean.org,
	hackers@FreeBSD.ORG, iedowse@maths.tcd.ie
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> In message <200003062015.NAA61215@harmony.village.org>, Warner Losh writes:
> 
> >: to
> >: 
> >: 	sh_subdirs=${SUBDIRS}; for f in $$sh_subdirs ; do ...
> >
> 
> >there's lots of other workarounds, from seeing if SUBDIRS is defined,
> >to using make's .foreach.
> 
> Another option is:
> 	
> 	for f in $$empty_list ${SUBDIRS}; do ...
> 
> where 'empty_list' is any undefined sh variable.

Not bad, but will break if the shell is run with the `-u' option on
for some reason.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)

Chet Ramey, CWRU    chet@po.CWRU.Edu    http://cnswww.cns.cwru.edu/~chet/


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