Date: Fri, 15 Sep 2000 08:43:58 +0100 From: Dominic Mitchell <hdm@mistral.co.uk> To: Gary Kline <kline@thought.org> Cc: Gregory Bond <gnb@itga.com.au>, Randall Hopper <aa8vb@nc.rr.com>, freebsd-stable@FreeBSD.ORG Subject: Re: "set -A" Bourne script - a nogo on FreeBSD Message-ID: <20000915084358.B77219@bizboz.mistral.co.uk> In-Reply-To: <200009150325.e8F3Pns34741@thought.org>; from kline@thought.org on Thu, Sep 14, 2000 at 08:25:48PM -0700 References: <200009150310.OAA26100@lightning.itga.com.au> <200009150325.e8F3Pns34741@thought.org>
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On Thu, Sep 14, 2000 at 08:25:48PM -0700, Gary Kline wrote:
> I have a csh or sh question--sorry for asking it this way;
> but is there any rational way of turning a file named
>
> foo.c to foo.o or simply foo with or without calling
> non-builtin programs? I think I remember a sh wizard
> showing me some bizarre sh command...but not sure it wasn't
> a dream!
$ fn=foo.c ; mv $fn ${fn%.c}.o
(Ideally I wouldn't need that semicolon there, but it doesn't appear to
work that way).
Look for the string "%%" in sh(1). Generally, it's a way of of
stripping the right hand side off of strings. Likewise, you can use "#"
and "##" to strip off the left hand side of strings. For example, a
minimal replacement for basename(1):
$ me=/usr/local/bin/myscript
$ echo ${me##*/}
myscript
Note that these mechanisms are derived from ksh, so are not available
under every /bin/sh in the world, only really *BSD and Linux.
-Dom
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