Command-line tool for moving/renaming multiple files.

mmv [options] [from] [to]

You use #[number] in your [to] to represent wildcards in your [from].

Add the -n flag to do a dry run when testing.

Remove part of filename
EG: All files Treme SxxExx.mp4 → SxxExx.mp4:

mmv 'Treme *' '#1'

Move files from child directories into parent, prefixing with directory name
EG: SAMPLES/PEOPLE/YEARGH.WAV → SAMPLES/PEOPLE_YEARGH.WAV:

mmv '*/*' '#1_#2'