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Sunday, September 17th, 2006

Dirty Things to do in Perl

Categories: [ IT ]

I just wanted to rename a bunch of files so that the new names are numbers like 1, 2, 3, 4… I could have written a short script doing that, but I wanted to see if rename was able to do it. Well, this works:

rename 's/.*/sprintf "Image-%02d.png", ++$main::i/e' *.png

(The original story is much worse: I wrote main::$i which of course did not work, so I took a look at the rename script, and noticed that I could use a variable which is already defined. I chose $verbose, which is initialized to 0 normally, but to 1 when the -n option is in use, hence the need to write ++$verbose when used with -n or -v and $verbose++ otherwise. Then I wrote this story about it, and only after that I noticed my mistake…)

[ Posted on September 17th, 2006 at 01:08 | no comment | ]

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