TR(1) UNIX Programmer's Manual TR(1) NAME tr - translate characters SYNOPSIS tr [ -cds ] [ string1 [ string2 ] ] DESCRIPTION _T_r copies the standard input to the standard output with substitution or deletion of selected characters. Input characters found in _s_t_r_i_n_g_1 are mapped into the correspond- ing characters of _s_t_r_i_n_g_2. When _s_t_r_i_n_g_2 is short it is pad- ded to the length of _s_t_r_i_n_g_1 by duplicating its last charac- ter. Any combination of the options -cds may be used: -c complements the set of characters in _s_t_r_i_n_g_1 with respect to the universe of characters whose ASCII codes are 01 through 0377 octal; -d deletes all input characters in _s_t_r_i_n_g_1; -s squeezes all strings of repeated output characters that are in _s_t_r_i_n_g_2 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' file2 SEE ALSO ed(1), ascii(7), expand(1) BUGS Won't handle ASCII NUL in _s_t_r_i_n_g_1 or _s_t_r_i_n_g_2; always deletes NUL from input. Printed 11/26/99 April 29, 1985 1