rename [ -v ] [ -n ] [ -f ] perlexpr [ files ]
"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/' *
Verbose: print names of files successfully renamed.
No Action: show what files would have been renamed.
Force: overwrite existing files.
No environment variables are used.
If you give an invalid Perl expression you'll get a syntax error.
The original "rename" did not check for the existence of target
filenames, so had to be used with care. I hope I've fixed that (Robin
perl v5.18.2 2014-01-14 RENAME(1)
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