Date: Mon, 6 Mar 2000 17:13:30 -0500 From: Chet Ramey <chet@nike.ins.cwru.edu> To: iedowse@maths.tcd.ie Cc: imp@village.org, jhix@mindspring.com, Doug@gorean.org, hackers@FreeBSD.ORG, iedowse@maths.tcd.ie Subject: Re: empty lists in for Message-ID: <1000306221330.AA36812.SM@nike.ins.cwru.edu>
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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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