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UNIX is a case sensitive platform: filenames, usernames, commands et cetera do distinguish between upper and lower case characters.

Problems may emerge when Perl programs for UNIX are to be ported to case-insensitive operating systems, and sometimes also in the reverse process. On some spots, upper-case and lower-case differences must be ignored to get it to work.

Instead of explicitly map all characters yourself, this Hash::Case packages can do this work for you implicitly. One simple tie added to your program can safe a lot of porting effort.