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1. this page intentionally left (taiganaut@quitter.se)'s status on Thursday, 12-Oct-2017 01:29:20 EDT this page intentionally left
   $ var="Hello World"
   $ echo ${var,,}
   hello world
   
   wat #bash #shell #wat
   1. clacke (clacke@social.heldscal.la)'s status on Thursday, 12-Oct-2017 01:45:05 EDT clacke

      in reply to
      @taiganaut Well yeah, that's what that syntax means. :-)
      
      I can't imagine there is something in particular one would intuitively expect it to mean.
      1. this page intentionally left (taiganaut@quitter.se)'s status on Thursday, 12-Oct-2017 02:06:42 EDT this page intentionally left

         in reply to
         @clacke why does it come out lower case?
         1. clacke (clacke@social.heldscal.la)'s status on Thursday, 12-Oct-2017 02:07:18 EDT clacke

            in reply to
            @taiganaut Because ${variablename,,} literally means "make this shit lower case".
            1. clacke (clacke@social.heldscal.la)'s status on Thursday, 12-Oct-2017 02:10:21 EDT clacke

               in reply to
               @taiganaut
               
               https://www.gnu.org/software/bash/manual/bash.html#index-parameter-expansion
               
               > ${parameter^pattern}
               > ${parameter^^pattern}
               > ${parameter,pattern}
               > ${parameter,,pattern}
               [ . . . ]
               > The ‘^’ operator converts lowercase letters matching pattern to uppercase; the ‘,’ operator converts matching uppercase letters to lowercase. The ‘^^’ and ‘,,’ expansions convert each matched character in the expanded value