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 stan-
       dard 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 charac-
              ter  that  is listed in SET1 with a single occur-
              rence 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  rep-
       resent themselves.  Interpreted sequences are:

       \NNN   character with octal value NNN (1 to 3 octal dig-
              its)

       \\     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 translat-
       ing, they may only be used in pairs to specify case con-
       version.   -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) 2004 Free Software Foundation, Inc.
       This is free software; see the source for copying condi-
       tions.  There is NO warranty; not even for MERCHANTABIL-
       ITY or FITNESS FOR A PARTICULAR PURPOSE.

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.



tr 5.3.0                 November 2004                    TR(1)