Subject: Re: /usr/bin/which is a csh script!!?!
To: NetBSD-current Discussion List <current-users@NetBSD.ORG>
From: Greg A. Woods <email@example.com>
Date: 04/30/2003 14:44:30
[ On Wednesday, April 30, 2003 at 19:05:41 (+0100), Ben Harris wrote: ]
> Subject: Re: /usr/bin/which is a csh script!!?!
> In article <20030430090531.Q26297@snowdrop.l8s.co.uk> you write:
> >> # NOTE: If this were a ksh script then it could just call "command -v"
> >Which also works in /bin/sh since it is required by posix.
> Which POSIX? IEEE Std 1003.1-2001 certainly doesn't include it, and neither
> does IEEE Std 1003.2-1992.
I think it was "command -v" being referred to there...
Perhaps the rationale from P1003.2a-D8 will help explain to everyone
what which is where:
The command -v and -V options were added to the UPE to satisfy
requirements from users that are currently accomplished by three
different historical utilities: type in the System V shell, whence in
the KornShell, and which in the C-shell. Since there is no historical
agreement on how and what to accomplish here, the POSIX command utility
was enhanced and the historical utilities were left unmodified. The C-
shell which merely conducts a path search. The KornShell whence is more
elaborate--in addition to the categories required by POSIX, it also
reports on tracked aliases, exported aliases, and undefined functions.
It goes on to talk about '-v' vs. '-V', the execution environment, types
of builtins, etc....
Greg A. Woods
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