## NAME

tr - translate or delete characters

## SYNOPSIS

tr [OPTION]... SET1 [SET2]

## DESCRIPTION

Translate, squeeze, and/or delete characters from standard input, writing to standard output.

-c, -C, --complement use the complement of SET1

-d, --delete delete characters in SET1, do not translate

-s, --squeeze-repeats replace each input sequence of a repeated character that is listed in SET1 with a single occurrence of that character

-t, --truncate-set1 first truncate SET1 to length of SET2

--help display this help and exit

--version output version information and exit

SETs are specified as strings of characters. Most represent themselves. Interpreted sequences are:

eNNN character with octal value NNN (1 to 3 octal digits)

ee backslash

ea audible BEL

eb backspace

ef form feed

en new line

er return

et horizontal tab

ev vertical tab

CHAR1-CHAR2 all characters from CHAR1 to CHAR2 in ascending order

[CHAR*] in SET2, copies of CHAR until length of SET1

[CHAR*REPEAT] REPEAT copies of CHAR, REPEAT octal if starting with 0

[:alnum:] all letters and digits

[:alpha:] all letters

[:blank:] all horizontal whitespace

[:cntrl:] all control characters

[:digit:] all digits

[:graph:] all printable characters, not including space

[:lower:] all lower case letters

[:print:] all printable characters, including space

[:punct:] all punctuation characters

[:space:] all horizontal or vertical whitespace

[:upper:] all upper case letters

[:xdigit:] all hexadecimal digits

[=CHAR=] all characters which are equivalent to CHAR

Translation occurs if -d is not given and both SET1 and SET2 appear. -t 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 SET1 if not translating nor deleting; else squeezing uses SET2 and occurs after translation or deletion.

## AUTHOR

Written by Jim Meyering.

## REPORTING BUGS

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report tr translation bugs to <http://translationproject.org/team/>

## COPYRIGHT

Copyright © 2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://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.

## SEE ALSO

Full documentation at: <http://www.gnu.org/software/coreutils/tr>
or available locally via: info (aq(coreutils) tr invocation(aq