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tr



SYNOPSIS

       tr [OPTION]... SET1 [SET2]


DESCRIPTION

       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 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  repre­
       sent 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

              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  char­
       acter   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 squeez­
       ing uses SET2 and occurs after translation or deletion.


AUTHOR

       Written by Jim Meyering.


REPORTING BUGS

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


COPYRIGHT

       Copyright © 2003 Free Software Foundation, Inc.
       This is free software; see the source for  copying  condi­
       tions.  There is NO warranty; not even for MERCHANTABILITY
  




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