TH TR 1
SH NAME
tr \- translate characters
SH SYNOPSIS
B tr
[
B -cds
]
[
I string1
[
I string2
]
]
SH DESCRIPTION
I Tr
copies the standard input to the standard output with
substitution or deletion of selected characters (runes).
Input characters found in
I string1
are mapped into the corresponding characters of
IR string2 .
When
I string2
is short it is padded to the length of
I string1
by duplicating its last character.
Any combination of the options
B -cds
may be used:
TP
B -c
Complement
IR string1 :
replace it with a lexicographically ordered
list of all other characters.
TP
B -d
Delete from input all characters in
IR string1 .
TP
B -s
Squeeze repeated output characters that occur in
I string2
to single characters.
PP
In either string a noninitial sequence
BI - x\f1,
where
I x
is any character (possibly quoted), stands for
a range of characters:
a possibly empty sequence of codes running from
the successor of the previous code up through
the code for
IR x .
The character
L \e
followed by 1, 2 or 3 octal digits stands for the
character whose
16-bit
value is given by those digits.
The character sequence
L \ex
followed by 1, 2, 3, or 4 hexadecimal digits stands
for the character whose
16-bit value is given by those digits.
A
L \e
followed by any other character stands
for that character.
SH EXAMPLES
Replace all upper-case
SM ASCII
letters by lower-case.
IP
EX
tr A-Z a-z <mixed >lower
EE
PP
Create a list of all
the words in
L file1
one per line in
LR file2 ,
where a word is taken to be a maximal string of alphabetics.
I String2
is given as a quoted newline.
IP
EX
tr -cs A-Za-z '
\&' <file1 >file2
EE
SH SOURCE
B /sys/src/cmd/tr.c
SH "SEE ALSO"
IR sed (1)
