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