TR

tr − translate or delete characters

tr [OPTION]... SET1 [SET2]

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

−c, −−complement

first complement SET1

−d, −−delete

delete characters in SET1, do not translate

−s, −−squeeze−repeats

replace sequence of characters with one

−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:

\NNN

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

\\

backslash

\a

audible BEL

\b

backspace

\f

form feed

\n

new line

\r

return

\t

horizontal tab

\v

vertical tab

CHAR1-CHAR2

all characters from CHAR1 to CHAR2 in ascending order

[CHAR1-CHAR2]

same as CHAR1-CHAR2, if both SET1 and SET2 use this

[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.

Written by Jim Meyering.

Report bugs to <bug-textutils@gnu.org>.

Copyright © 1999 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The full documentation for tr is maintained as a Texinfo manual. If the info and tr programs are properly installed at your site, the command

info tr

should give you access to the complete manual.