TR(1) TR(1)
NAME
tr - translate characters
SYNOPSIS
tr [ -cds ] [ string1 [ string2 ] ]
DESCRIPTION
Tr copies the standard input to the standard output with
substitution or deletion of selected characters (runes).
Input characters found in string1 are mapped into the corre-
sponding characters of string2. When string2 is short it is
padded to the length of string1 by duplicating its last
character. Any combination of the options -cds may be used:
-c Complement string1: replace it with a lexicographically
ordered list of all other characters.
-d Delete from input all characters in string1.
-s Squeeze repeated output characters that occur in
string2 to single characters.
In either string a noninitial sequence -x, where x is any
character (possibly quoted), stands for a range of charac-
ters: a possibly empty sequence of codes running from the
successor of the previous code up through the code for x.
The character `\' followed by 1, 2 or 3 octal digits stands
for the character whose 16-bit value is given by those dig-
its. The character sequence `\x' followed by 1 to 6 hex-
adecimal digits stands for the character whose 21-bit value
is given by those digits. A `\' followed by any other char-
acter stands for that character.
EXAMPLES
Replace all upper-case ASCII letters by lower-case.
tr A-Z a-z <mixed >lower
Create 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. String2 is given as a quoted newline.
tr -cs A-Za-z '
' <file1 >file2
SOURCE
/appl/cmd/tr.b
Page 1 Plan 9 (printed 12/22/24)