1TR(1)                       General Commands Manual                      TR(1)
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NAME

6       tr - translate characters
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SYNOPSIS

9       tr [ -cds ] [ string1 [ string2 ] ]
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DESCRIPTION

12       Tr  copies  the standard input to the standard output with substitution
13       or deletion of selected characters.  Input characters found in  string1
14       are  mapped into the corresponding characters of string2.  When string2
15       is short it is padded to the length of string1 by duplicating its  last
16       character.  Any combination of the options -cds may be used: -c comple‐
17       ments the set of characters in string1 with respect to the universe  of
18       characters  whose ASCII codes are 01 through 0377 octal; -d deletes all
19       input characters in string1; -s squeezes all strings of repeated output
20       characters that are in string2 to single characters.
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22       In either string the notation a-b means a range of characters from a to
23       b in increasing ASCII order.  The character `\' followed by 1, 2  or  3
24       octal  digits  stands  for  the  character whose ASCII code is given by
25       those digits.  A `\' followed by any other character  stands  for  that
26       character.
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28       The  following  example  creates a list of all the words in `file1' one
29       per line in `file2', where a word is taken to be a  maximal  string  of
30       alphabetics.   The  second  string  is  quoted  to protect `\' from the
31       Shell.  012 is the ASCII code for newline.
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33              tr -cs A-Za-z ´\012´ <file1 >file2
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SEE ALSO

36       ed(1), ascii(7)
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BUGS

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