Table of Contents

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
first complement 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:

\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

[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

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

Copyright

Copyright (C) 2006 Free Software Foundation, Inc. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.

See Also

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.

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