TR(1)                                SysV                                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 corresponding 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 introduce 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 addition, \ 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).
     ascii(5) in the Programmer's Reference Manual.

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