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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