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researchv10 Dan Cross

.TH TR 1
.CT 1 shell
.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.
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 8-bit unsigned 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,
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
.I x.
The character
.L \e
followed by 1, 2 or 3 octal digits stands for the
character whose
.SM ASCII
code is given by those digits.
A 
.L \e
followed by any other character stands
for that character.
.SH EXAMPLES
.TP
.B tr A-Z a-z <mixed >lower
Replace all upper-case letters by lower-case.
.EX
tr -cs A-Za-z '
\&' <file1 >file2
.EE
.ns
.IP
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.
.SH "SEE ALSO"
.IR ed (1), 
.IR ascii (6)

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