Another useful command could be [rocketmouse at archlinux ~]$ man rename | grep EXAMPLES -A10 EXAMPLES Given the files foo1, ..., foo9, foo10, ..., foo278, the commands rename foo foo0 foo? rename foo foo0 foo?? will turn them into foo001, ..., foo009, foo010, ..., foo278. And rename .htm .html *.htm will fix the extension of your html files.