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    rename can handle multiple files as argument, you can vastly speed things up by using + instead of \; if there are many such files Commented Feb 17, 2015 at 8:57
  • Still, it is a useful option since "*.txt" can unroll to a large argument list unsupported by the shell. Commented Oct 19, 2016 at 13:14
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    "s/oldExtension/newExtension/" will fail for footxt.txt. Use this instead: unix.stackexchange.com/questions/19654/… Commented Aug 1, 2017 at 23:59