tr: Translate, squeeze, and/or delete characters

Synopsis:

tr [option]... set1 [set2]

tr copies standard input to standard output, performing one of the following operations:

• translate, and optionally squeeze repeated characters in the result,
• squeeze repeated characters,
• delete characters,
• delete characters, then squeeze repeated characters from the result.

The set1 and (if given) set2 arguments define ordered sets of characters, referred to below as set1 and set2. These sets are the characters of the input that tr operates on. The `--complement' (`-c') option replaces set1 with its complement (all of the characters that are not in set1).

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