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Unix Version 7 - man page for tr (v7 section 1)

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TR(1)											    TR(1)

       tr - translate characters

       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.   When	string2 is short it is padded to the length of string1 by
       duplicating its last character.	Any combination of the options -cds may be used: -c  com-
       plements the set of characters in string1 with respect to the universe of characters whose
       ASCII codes are 01 through 0377 octal; -d deletes all  input  characters  in  string1;  -s
       squeezes  all  strings of repeated output characters that are in string2 to single charac-

       In either string the notation a-b means a range of characters from a to	b  in  increasing
       ASCII  order.  The character `\' followed by 1, 2 or 3 octal digits stands for the charac-
       ter whose ASCII code is given by those digits.  A `\'  followed	by  any  other	character
       stands for that character.

       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 second string is  quoted
       to protect `\' from the Shell.  012 is the ASCII code for newline.

	      tr -cs A-Za-z '\012' <file1 >file2

       ed(1), ascii(7)

       Won't handle ASCII NUL in string1 or string2; always deletes NUL from input.

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