The tr utility shall conform to the Base Definitions volume of
POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines.
The following options shall be supported:
-c Complement the set of values specified by string1. See
the EXTENDED DESCRIPTION section.
-C Complement the set of characters specified by string1.
See the EXTENDED DESCRIPTION section.
-d Delete all occurrences of input characters that are
specified by string1.
-s Replace instances of repeated characters with a single
character, as described in the EXTENDED DESCRIPTION
section.
