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Linux 2.6 - man page for tr (linux section 1)

TR(1)					  User Commands 				    TR(1)

NAME
       tr - translate or delete characters

SYNOPSIS
       tr [OPTION]... SET1 [SET2]

DESCRIPTION
       Translate, squeeze, and/or delete characters from standard input, writing to standard out-
       put.

       -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:

       \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 guar-
       anteed 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 tr bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report tr translation bugs to <http://translationproject.org/team/>

COPYRIGHT
       Copyright  (C)  2010  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
       The  full documentation for tr is maintained as a Texinfo manual.  If the info and tr pro-
       grams are properly installed at your site, the command

	      info coreutils 'tr invocation'

       should give you access to the complete manual.

GNU coreutils 8.5			  February 2011 				    TR(1)


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