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  • And your shell is…? See your shell's manual to find out whether it supports ** syntax in globbing. bash (with globstar turned on) and zsh does. Commented Jul 24, 2013 at 10:37
  • If possible, you should backup your files before running anything. Commented Jul 24, 2013 at 14:17
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    See also Renaming files to have lower case extensions with 'rename' and Lowercasing all directories under a directory for other methods of changing the case of file names. Commented Jul 25, 2013 at 2:00
  • Obligatory 'Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems.' but with a smattering of history that I'd not seen regex.info/blog/2006-09-15/247 Commented Jul 25, 2013 at 5:19