[Pdx-pm] command line question

Colin Kuskie ckuskie at dalsemi.com
Mon Jul 12 16:16:49 CDT 2004

On Mon, Jul 12, 2004 at 02:10:37PM -0700, Thomas J Keller wrote:
> This seems like one of those easy things easier ...things
> I want to rename all the files in a directory substituting an 
> underscore for any spaces in the filename. I can write a program using 
> IO::Dir, But it seems like that should be doable from the command line.
> Help?
> Thanks,
> Tom K.

The original perl distribution used to include a program called rename
that allowed you to pass a line of perl code that would modify each
filename in any way you want.

ren 'tr/ /_/;' *


#Usage: ren perlexpr [files]

($op = shift) or die "Usage: ren perlexpr [filenames]\n";

if (!@ARGV) {
  @ARGV = <STDIN>;

for (@ARGV) {
  $was = $_;
  eval $op;
  die $@ if $@;
  unless ($was eq $_) {
    rename($was,$_) or die "Unable to rename $was: $!\n";

=head1 NAME

B<ren> - use a perl expression to rename multiple files


B<ren> perl_expression [files]


B<Ren> uses a perl expression to rename multiple files.  For more information about
perl expressions, consult the perl man pages, F<Learning Perl> by Randal
Schwartz, F<Programming Perl> by Larry Wall, or your local friendly
Perl programmer.

For example, to rename all files foo.* to bar.*, use

  ren 's/foo/bar/;' foo.*

=head1 AUTHORS

Randal Schwartz, Larry Wall

=head1 DATE

October 11, 1996


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