TR(1) TR(1) NAME tr - translate characters SYNOPSIS tr [ -cds ] [ string1 [ string2 ] ] DESCRIPTION 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 correspond- ing characters of string2. When string2 is short it is pad- ded to the length of string1 by duplicating its last charac- ter. Any combination of the options -cds may be used: -c complement the set of characters in string1 with respect to the universe of characters whose ASCII codes are 01 through 0377 -d delete all input characters in string1 -s squeeze all strings of repeated output characters that are in string2 to single characters In either string the notation a-b means a range of charac- ters from a to b in increasing ASCII order. The character `\' followed by 1, 2 or 3 octal digits stands for the char- acter whose ASCII code is given by those digits. A `\' fol- lowed 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 SEE ALSO ed(1), ascii(7) BUGS Won't handle ASCII NUL in string1 or string2; always deletes NUL from input.