As a one-liner: 
perl -0777E '$s{$_}++ for split//,<>; say "$_ ", $s{$_}||0 for "a".."z
+", "A".."Z"' your-data-file

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I would count all characters, and at the end only display the characters you are interested in.

In reply to Re: Hash to count characters by JavaFan
in thread Hash to count characters by amittleider

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