do you have rename on debian? idk, but since it's available on ubuntu, I guess so.
NAME
rename - renames multiple files
SYNOPSIS
rename [ -v ] [ -n ] [ -f ] perlexpr [ files ]
DESCRIPTION
"rename" renames the filenames supplied according to the rule
specified
as the first argument. The perlexpr argument is a Perl expression
which is expected to modify the $_ string in Perl for at least some of
the filenames specified. If a given filename is not modified by the
expression, it will not be renamed. If no filenames are given on
the
command line, filenames will be read via standard input.
For example, to rename all files matching "*.bak" to strip the
extension, you might say
rename 's/\.bak$//' *.bak
To translate uppercase names to lower, you'd use
rename 'y/A-Z/a-z/' *
an example copied from a google result might be already quite near to what you want:
Here is an example of the rename command:
rename -n ’s/.htm$/.html/’ *.htm
The -n means that it's a test run and
will not actually change any files. It
will show you a list of files that
would be renamed if you removed the
-n. In the case above, it will convert all files in the current directory
from a file extension of .htm to
.html.
If the output of the above test run
looked ok then you could run the final
version:
rename -v ’s/.htm$/.html/’ *.htm
The -v is optional, but it's a good
idea to include it because it is the
only record you will have of changes
that were made by the rename
command....