4.3BSD-UWisc/man/cat1/tr.1

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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), 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 12/27/86         April 29, 1985                         1