tr(1)                    USER COMMANDS                      tr(1)



NAME
     tr - translate characters

SYNOPSIS
     tr [ -cds ] [ string1 [ string2 ] ]

DESCRIPTION
     tr copies the standard input to  the  standard  output  with
     substitution  or  deletion  of  selected  characters.  Input
     characters found in string1 are mapped into the  correspond-
     ing  characters  of string2.  Any combination of the options
     -cds may be used:

     -c      Complements the set of characters  in  string1  with
             respect  to  the  universe of characters whose ASCII
             codes are 001 through 377 octal.

     -d      Deletes all input characters in string1.

     -s      Squeezes all strings of repeated  output  characters
             that are in string2 to single characters.

     The following abbreviation conventions may be used to intro-
     duce  ranges  of  characters or repeated characters into the
     strings:

     [a-z]   Stands for the  string  of  characters  whose  ASCII
             codes   run   from   character  a  to  character  z,
             inclusive.

     [a*n]   Stands for n repetitions of a.  If the  first  digit
             of  n  is  0, n is considered octal; otherwise, n is
             taken to be decimal.  A zero or missing n  is  taken
             to  be  huge;  this  facility  is useful for padding
             string2.

     The escape character \ may be used as in the shell to remove
     special  meaning  from  any character in a string.  In addi-
     tion, \ followed by 1, 2, or 3 octal digits stands  for  the
     character whose ASCII code is given by those digits.

EXAMPLE
     The following example creates a list of  all  the  words  in
     file1  one  per line in file2, where a word is taken to be a
     maximal string of alphabetics.  The strings  are  quoted  to
     protect  the  special  characters from interpretation by the
     shell; 012 is the ASCII code for newline.

             tr -cs "[A-Z][a-z]" "[\012*]" <file1 >file2

SEE ALSO
     ed(1), sh(1).



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tr(1)                    USER COMMANDS                      tr(1)



     ascii(5) in the System Administrator's Reference Manual.

BUGS
     Will not handle ASCII NUL  in  string1  or  string2;  always
     deletes NUL from input.


















































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