TR(I)                        5/20/74                        TR(I)


     tr - transliterate


     tr [ -cds ] [ string1 [ string2 ] ]


     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-b] stands for the string of characters whose ascii  codes

     run from character a to character b.

     [a*n], where n is an integer or  empty,  stands  for  n-fold

     repetition  of  character  a.   n  is  taken  to be octal or

     decimal according as its first digit is or is not  zero.   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  sh  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.

     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


     sh (I), ed (I), ascii (V)


     Won't handle ascii NUL in string1 or string2; always deletes

     NUL from input.