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