TR(1)                                                                    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 corresponding characters of _s_t_r_i_n_g_2.  When _s_t_r_i_n_g_2
       is short it is padded to the length of _s_t_r_i_n_g_1 by duplicating its  last
       character.  Any combination of the options -cds may be used: -c comple‐
       ments 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 characters from _a to
       _b in increasing ASCII order.  The character ‘\’ followed by 1, 2  or  3
       octal  digits  stands  for  the  character 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

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.



7th Edition                     April 29, 1985                           TR(1)