Renames multiple files.

• Rename files using a Perl Common Regular Expression (substitute 'foo' with 'bar' wherever found):
  rename 's/foo/bar/' \*
• Dry-run - display which renames would occur without performing them:
  rename -n 's/foo/bar/' \*
• Force renaming even if the operation would overwrite existing files:
  rename -f 's/foo/bar/' \*
• Convert filenames to lower case (use `-f` in case-insensitive filesystems to prevent "already exists" errors):
  rename 'y/A-Z/a-z/' \*
• Replace whitespace with underscores:
  rename 's/\s+/_/g' \*

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