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+.th TR I 9/24/73
+.sh NAME
+tr \*- transliterate
+.sh SYNOPSIS
+.bd tr
+[
+.bd \*-cds
+] [ string1 [ string2 ] ]
+.sh DESCRIPTION
+.it Tr
+copies the standard input to the standard output with 
+substitution or deletion of selected characters.
+Input characters found in 
+.it string1
+are mapped into the corresponding characters of
+.it string2.
+If 
+.it string2
+is short, it is padded with corresponding characters from
+.it string1.
+Any combination of the options
+.bd \*-cds
+may be used.
+.bd \*-c
+complements the set of characters in
+.it string1
+with respect to the universe of characters
+whose ascii codes are 001 through 377 octal.
+.bd \*-d
+deletes all input characters not in
+.it string1.
+.bd \*-s
+squeezes all strings of repeated output characters that are
+in 
+.it string2
+to single characters.
+.s3
+The following abbreviation conventions may be used
+to introduce ranges of characters or repeated characters into
+the strings:
+.s3
+\fB[\fIa\*|\fB\*-\fIb\fB\*|]\fR
+stands for the string of characters whose ascii codes run
+from character
+.it a
+to character
+.it b.
+.s3
+\fB[\fIa\fB\*|*\fIn\fB\*|]\fR,
+where
+.it n
+is an integer or empty, stands for \fIn\fR-fold 
+repetition of character
+.it a.
+.it n
+is taken to be octal or decimal according as its
+first digit is or is not zero.
+A zero or missing
+.it n
+is taken to be huge;
+this facility is useful for padding
+.it string2.
+.s3
+The escape character `\\' may be used as in
+.it sh
+to remove special meaning from any character in a string.
+In addition,
+`\\' followed by 1, 2 or 3 octal digits stands for the
+character whose ascii code is given by those digits.
+.s3
+The following example creates a list of all
+the words in `file1' one per line in `file2',
+where a word is taken to be a maximal string of alphabetics.
+The strings are quoted
+to protect the special characters from interpretation by the Shell;
+012 is the ascii code for newline.
+.s3
+.ti +8
+tr \*-cs "[A\*-Z][a\*-z]" "[\\012*]" <file1 >file2
+.sh "SEE ALSO"
+sh(I), ed(I), ascii(VII)
+.sh BUGS
+Won't handle ascii NUL.
+.br
+Also, Kernighan's Lemma can really bite you;
+try looking for strings which have \\ and * in them.