tr - translate or delete characters
Translate, squeeze, and/or delete characters from standard input, writing to
- -c, -C, --complement
- use the complement of SET1
- -d, --delete
- delete characters in SET1, do not translate
- -s, --squeeze-repeats
- replace each sequence of a repeated character that is listed in the last
specified SET, with a single occurrence of that character
- -t, --truncate-set1
- first truncate SET1 to length of SET2
- display this help and exit
- output version information and exit
SETs are specified as strings of characters. Most represent themselves.
Interpreted sequences are:
- character with octal value NNN (1 to 3 octal digits)
- audible BEL
- form feed
- new line
- horizontal tab
- vertical tab
- all characters from CHAR1 to CHAR2 in ascending order
- in SET2, copies of CHAR until length of SET1
- REPEAT copies of CHAR, REPEAT octal if starting with 0
- all letters and digits
- all letters
- all horizontal whitespace
- all control characters
- all digits
- all printable characters, not including space
- all lower case letters
- all printable characters, including space
- all punctuation characters
- all horizontal or vertical whitespace
- all upper case letters
- all hexadecimal digits
- all characters which are equivalent to CHAR
Translation occurs if -d
is not given and both SET1 and SET2 appear.
may be used only when translating. SET2 is extended to length of
SET1 by repeating its last character as necessary. Excess characters of SET2
are ignored. Only [:lower:] and [:upper:] are guaranteed to expand in
ascending order; used in SET2 while translating, they may only be used in
pairs to specify case conversion. -s
uses the last specified SET, and
occurs after translation or deletion.
Written by Jim Meyering.
GNU coreutils online help: <https://www.gnu.org/software/coreutils/>
Report tr translation bugs to <https://translationproject.org/team/>
Copyright © 2018 Free Software Foundation, Inc. License GPLv3+: GNU GPL
version 3 or later <https://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO
WARRANTY, to the extent permitted by law.
Full documentation at: <https://www.gnu.org/software/coreutils/tr>
or available locally via: info '(coreutils) tr invocation'