Re: Renaming multiple files

["Thomas Köhler" <jean-luc@picard.franken.de>]

On Sat, Jan 15, 2000 at 06:07:47PM +0100,
Andre Pang <andrep-ml@vjolnir.org> wrote:
> 
> On Sat, Jan 15, 2000 at 10:52:48AM -0600, Andrei Zmievski wrote:
> 
> > How can I rename all files with one extension to another? For example,
> > all *.phtml files to *.php.
> 
> My (fairly dumb) solution:
> 
> for i in *.phtml; do mv $i $(basename $i .phtml).php; done
>
> It does have the advantage of being fairly easy to remember and it'll work
> on any shell.  (Well, if you change $(...) to `...`, anyway.)
> 
> I'm sure somebody here can come up with an answer that'll win some
> obsfucated "How to rename all files with one extension to another" zsh
> content :).

for i in *.phtml ; do mv $i ${i:r}.php ; done

Well, works with zsh - and is of course shorter, doesn't need basename
etc... :-)

jean-luc@picard (ttypts/5) ~> which basename
/bin/basename

-> No extra process, this starts to get really funny if you rename a few
thousand files at once :-)

Here's a test:
jean-luc@picard (ttypts/5) ~/test/zsh> for i in {1..1000} ;
do touch $i.phtml ; done

jean-luc@picard (ttypts/5) ~/test/zsh> time (for i in *.phtml;
 do mv $i $(basename $i .phtml).php; done)
( for i in *.phtml; do; mv $i $(basename $i .phtml).php; done )
 7,16s user 9,94s system 98% cpu 17,380 total

jean-luc@picard (ttypts/5) ~/test/zsh> time (for i in *.php;
do mv $i ${i:r}.phtml; done)     
( for i in *.php; do; mv $i ${i:r}.phtml; done )
 3,22s user 5,04s system 99% cpu 8,328 total

Hey, that's more than twice as fast ;-)

CU,
Thomas

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