From: Ryan Davis <ryand-ruby@...>
Date: 2009-08-08T12:36:30+09:00
Subject: Re: I want a script can do this


On Aug 7, 2009, at 19:32 , Jacky Cheung wrote:

> I want a script can do this:
> a directory aa , under aa has many files. i want batch rename all  
> files.
> like this
> the file name is test01 test02 test03 ... test09 test10 test11...  
> test29....
> rename
> test1 test2 test3 ....test9 test10 test29.....
>
> how can i write this script?

Below is an equivalent perl script that I've used for years and years.  
It should be exceedingly simple to convert to ruby (or just use it as- 
is) and/or simplify for your requirements.

You'd use it like so:

> % rename 's/(\D)0+(\d)/$1$2/' aa/*


Here ya go:

> #!/usr/bin/perl -w
>
> # Usage: rename perlexpr [files]
>
> ($op = shift) || die "Usage: rename perlexpr [filenames]\n";
> if (!@ARGV) {
>     @ARGV = <STDIN>;
>     chop(@ARGV);
> }
> for (@ARGV) {
>     $was = $_;
>     eval $op;
>     die $@ if $@;
>     rename($was,$_) unless $was eq $_;
> }