tr man page on Plan9

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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 (runes).  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     Complement  string1: replace it with a lexicographically ordered
	      list of all other characters.

       -d     Delete from input all characters in string1.

       -s     Squeeze repeated output characters that occur in string2 to sin‐
	      gle characters.

       In  either  string  a  noninitial sequence -x, where x is any character
       (possibly quoted), stands for a range of characters: a  possibly	 empty
       sequence	 of  codes  running from the successor of the previous code up
       through the code for x.	The character followed by 1, 2 or 3 octal dig‐
       its  stands for the character whose 16-bit value is given by those dig‐
       its.  The character sequence followed by	 1  to	6  hexadecimal	digits
       stands  for  the character whose 21-bit value is given by those digits.
       A followed by any other character stands for that character.

       Replace all upper-case ASCII letters by lower-case.

	      tr A-Z a-z <mixed >lower

       Create a list of all the words in one per line in where a word is taken
       to  be  a  maximal string of alphabetics.  String2 is given as a quoted

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



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