32v 1m tr

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' <file1 >file2

SEE ALSO

    ed(1), ascii(7)

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.