Batch rename files in Bash

$ rename s/"SEARCH"/"REPLACE"/g *

This will replace the string SEARCH with REPLACE in every file (that is, *). The /g means global, so if you had a "SEARCH SEARCH.jpg", it would be renamed "REPLACE REPLACE.jpg". If you didn't have /g, it would have only done substitution once, and thus now named "REPLACE SEARCH.jpg". If you want case insensitive, add /i (that would be, /gi or /ig at the end).

With regular expressions, you can do lots more. For example, if you want to append something to every file: $ rename s/'^'/'MyPrefix'/ * That would add MyPrefix to the beginning of every filename. You can also do ending: $ rename s/'$'/'MySuffix'/ *

Also, the -n option will just show what would be renamed, then exit. This is useful, because you can make sure you have your command right before messing all your filenames up. :)