(coreutils.info)tr invocation

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9.1 ‘tr’: Translate, squeeze, and/or delete characters
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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’, ‘-C’) option replaces SET1 with its complement (all of the
characters that are not in SET1).

   Currently ‘tr’ fully supports only single-byte characters.
Eventually it will support multibyte characters; when it does, the ‘-C’
option will cause it to complement the set of characters, whereas ‘-c’
will cause it to complement the set of values.  This distinction will
matter only when some values are not characters, and this is possible
only in locales using multibyte encodings when the input contains
encoding errors.

   The program accepts the ‘--help’ and ‘--version’ options.  Note:
Common options.  Options must precede operands.

   An exit status of zero indicates success, and a nonzero value
indicates failure.

Character sets

Specifying sets of characters.

Translating

Changing one set of characters to another.

Squeezing and deleting

Removing characters.