71 lines
1.7 KiB
Groff
71 lines
1.7 KiB
Groff
.TH TR 1
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.SH NAME
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tr \- translate character codes
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.SH SYNOPSIS
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\fBtr\fR [\fB\-cds\fR]\fR [\fIstring1\fR] [\fIstring2\fR]\fR
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP 20
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\\fB\\$1\\fR
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# \\$2
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..
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.SH OPTIONS
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.TP 5
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.B \-c
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# Complement the set of characters in \fIstring1\fR
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.TP 5
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.B \-d
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# Delete all characters specified in \fIstring1\fR
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.TP 5
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.B \-s
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# Squeeze all runs of characters in \fIstring1\fR to one character
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.SH EXAMPLES
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.TP 20
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.B tr \(fmA\-Z\(fm \(fma\-z\(fm <x >y
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# Convert upper case to lower case
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.TP 20
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.B tr \-d \(fm0123456789\(fm <f1 >f2
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# Delete all digits from \fIf1\fR
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.SH DESCRIPTION
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.PP
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.I Tr
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performs simple character translation.
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When no flag is specified, each character in
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.I string1
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is mapped onto the corresponding character in
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.I string2 .
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.PP
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There are two types of
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.I tr
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out there, one that requires [ and ] for character classes, and one that does
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not. Here is what the example above would look like for a
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.I tr
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that needs the brackets:
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.PP
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.RS
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.B "tr \(fm[A\-Z]\(fm \(fm[a\-z]\(fm <x >y"
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.RE
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.PP
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Use [ and ] if you want to be portable, because a
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.I tr
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that doesn't need them will still accept the syntax and mindlessly
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translate [ into [ and ] into ].
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.PP
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MINIX tr supports the following character classes: alnum, alpha, digit, lower,
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upper and xdigit. If any of these keywords is encountered between backets and
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colons, it is replaced by respectively alphanumeric characters, alphabetic
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characters, decimal digits, lowercase letters, uppercase letters and
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hexadecimal digits. The following are equivalent with the given examples:
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.TP 20
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.B tr \(fm[:upper:]\(fm \(fm[:lower:]\(fm <x >y
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# Convert upper case to lower case
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.TP 20
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.B tr \-d \(fm[:digit:]\(fm <f1 >f2
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# Delete all digits from \fIf1\fR
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