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| [9] | 1 | .TH TR 1
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| 2 | .SH NAME
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| 3 | tr \- translate character codes
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| 4 | .SH SYNOPSIS
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| 5 | \fBtr\fR [\fB\-cds\fR]\fR [\fIstring1\fR] [\fIstring2\fR]\fR
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| 6 | .br
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| 7 | .de FL
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| 8 | .TP
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| 9 | \\fB\\$1\\fR
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| 10 | \\$2
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| 11 | ..
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| 12 | .de EX
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| 13 | .TP 20
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| 14 | \\fB\\$1\\fR
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| 15 | # \\$2
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| 16 | ..
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| 17 | .SH OPTIONS
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| 18 | .FL "\-c" "Complement the set of characters in \fIstring1\fR"
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| 19 | .FL "\-d" "Delete all characters specified in \fIstring1\fR"
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| 20 | .FL "\-s" "Squeeze all runs of characters in \fIstring1\fR to one character"
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| 21 | .SH EXAMPLES
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| 22 | .EX "tr \(fmA\-Z\(fm \(fma\-z\(fm <x >y " "Convert upper case to lower case"
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| 23 | .EX "tr \-d \(fm0123456789\(fm <f1 >f2 " "Delete all digits from \fIf1\fR"
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| 24 | .SH DESCRIPTION
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| 25 | .PP
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| 26 | .I Tr
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| 27 | performs simple character translation.
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| 28 | When no flag is specified, each character in
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| 29 | .I string1
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| 30 | is mapped onto the corresponding character in
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| 31 | .I string2 .
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| 32 | .PP
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| 33 | There are two types of
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| 34 | .I tr
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| 35 | out there, one that requires [ and ] for character classes, and one that does
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| 36 | not. Here is what the example above would look like for a
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| 37 | .I tr
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| 38 | that needs the brackets:
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| 39 | .PP
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| 40 | .RS
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| 41 | .B "tr \(fm[A\-Z]\(fm \(fm[a\-z]\(fm <x >y"
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| 42 | .RE
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| 43 | .PP
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| 44 | Use [ and ] if you want to be portable, because a
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| 45 | .I tr
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| 46 | that doesn't need them will still accept the syntax and mindlessly
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| 47 | translate [ into [ and ] into ].
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