Date: Sun, 17 Dec 2000 22:21:46 -0800 From: Doug Barton <DougB@gorean.org> To: Tim McMillen <timcm@umich.edu> Cc: Dru <genisis@istar.ca>, Otter <otterr@telocity.com>, Drew Tomlinson <drewt@writeme.com>, "FreeBSD Questions (E-mail)" <freebsd-questions@FreeBSD.ORG> Subject: Re: Command to Re-Read Paths? Message-ID: <3A3DACFA.E231DE42@gorean.org> References: <Pine.SOL.4.10.10012172112130.3899-100000@frogger.gpcc.itd.umich.edu>
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Tim McMillen wrote:
> And csh (and tcsh) are the only ones that keep the hash table of
> commands. The others just search through the path. As I was informed the
> last time I asked about rehash, csh maintains this hash table to make
> command execution slightly more efficient by speeding the finding of the
> executeable. Other shells don't do this.
Actually, just about every modern shell keeps a hash table of commands
its already seen. All of the "advanced" bourne shell derivatives (like
bash, my shell for example) that I am aware of do.
$ type mount
mount is hashed (/sbin/mount)
The difference is that the bourne shell derivatives are smart enough to
scan the PATH again automatically when the user requests a command it
hasn't already seen. :)
Doug
--
"The most difficult thing in the world is to know how to do a thing
and
to watch someone else do it wrong without comment."
-- Theodore H. White
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