tr - Unix, Linux Command

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.

Tag	Description
-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 © 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.