tr
$ tr [--complement] [--delete] [--squeeze-repeats] <from> [to]
--help
: Display help message and exit--version
: Print version-c
, --complement
: Take the complement of the first set-d
, --delete
: Delete characters instead of replacing-s
, --squeeze-repeats
: Omit repeated characters listed in the last given set from the outputfrom
: Set of characters to translate fromto
: Set of characters to translate to