tr - translate characters
/usr/ucb/tr [-cds] [ string1 [string2]]
The tr utility copies the standard input to the standard
output with substitution or deletion of selected characters.
The arguments string1 and string2 are considered sets of
characters. Any input character found in string1 is mapped
into the character in the corresponding position within
string2. When string2 is short, it is padded to the length
of string1 by duplicating its last character.
In either string the notation:
denotes 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. As with the shell, the escape character \,
followed by any other character, escapes any special meaning
for that character.
Any combination of the options -c, -d, or -s 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 octal.
-d Delete all input characters in string1.
-s Squeeze all strings of repeated output characters that
are in string2 to single characters.
Example 1: Creating a list of all the words in a filename
The following example creates a list of all the words in
filename1, one per line, in filename2, 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
example% tr -cs A-Za-z '\012' <filename1>filename2
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Availability | SUNWscpu |
ed(1), ascii(5), attributes(5)
Will not handle ASCII NUL in string1 or string2. tr always
deletes NUL from input.
Man(1) output converted with