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+.TH LOOK 1
+.CT 1 files
+.SH NAME
+look \(mi find lines in a sorted list
+.SH SYNOPSIS
+.B look
+[
+.BI -dfnixt c
+]
+[
+.I string
+]
+[
+.I file
+]
+.SH DESCRIPTION
+.I Look
+consults a sorted
+.I file
+and prints all lines that begin with
+.IR string .
+It uses binary search.
+.PP
+The following options are recognized.
+Options
+.BI dfnt c
+affect comparisons as in
+.IR  sort (1).
+.TP
+.B -i
+Interactive.
+There is no
+.I string
+argument; instead
+.I look
+takes lines from the standard input as strings to be looked up.
+.TP
+.B -x
+Exact.
+Print only lines of the file whose key matches
+.I string
+exactly.
+.TP
+.B  -d
+`Directory' order:
+only letters, digits,
+tabs and blanks participate in comparisons.
+.TP
+.B  -f
+Fold.
+Upper case letters compare equal to lower case.
+.TP
+.B -n
+Numeric comparison with initial string of digits, optional minus sign,
+and optional decimal point.
+.TP
+.BI -t c
+`Tab character'
+.I c
+terminates the sort key in the
+.I file.
+.PP
+If no
+.I file
+is specified,
+.F /usr/dict/words
+is assumed, with collating sequence
+.BR df .
+.SH FILES
+.F /usr/dict/words
+.SH "SEE ALSO"
+.IR sort (1), 
+.IR gre (1), 
+.IR dict (7)
+.SH DIAGNOSTICS
+.I Look
+returns exit status 0 if
+.I string
+is found, 1 if not found, 2 for error.