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.TH LOOK 1
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.SH NAME
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look \- find lines in a sorted list
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.SH SYNOPSIS
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.B look
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[
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.BI -dfnixt c
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]
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[
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.I string
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]
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[
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.I file
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]
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.SH DESCRIPTION
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.I Look
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consults a sorted
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.I file
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and prints all lines that begin with
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.IR string .
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It uses binary search.
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.PP
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The following options are recognized.
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Options
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.B dfnt
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affect comparisons as in
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.IR  sort (1).
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.TP
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.B -i
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Interactive.
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There is no
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.I string
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argument; instead
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.I look
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takes lines from the standard input as strings to be looked up.
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.TP
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.B -x
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Exact.
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Print only lines of the file whose key matches
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.I string
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exactly.
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.TP
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.B  -d
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`Directory' order:
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only letters, digits,
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tabs and blanks participate in comparisons.
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.TP
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.B  -f
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Fold.
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Upper case letters compare equal to lower case.
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.TP
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.B -n
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Numeric comparison with initial string of digits, optional minus sign,
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and optional decimal point.
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.TP
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.BR -t [ \f2c\f1 ]
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Character
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.I c
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terminates the sort key in the
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.IR file .
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By default, tab terminates the key.  If
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.I c
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is missing the entire line comprises the key.
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.PP
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If no
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.I file
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is specified,
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.B /lib/words
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is assumed, with collating sequence
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.BR df .
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.SH FILES
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.B /lib/words
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.SH SOURCE
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.B /sys/src/cmd/look.c
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.SH "SEE ALSO"
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.IR sort (1),
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.IR grep (1)
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.SH DIAGNOSTICS
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The exit status is
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.RB `` "not found" ''
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if no match is found, and
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.RB `` "no dictionary" ''
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if
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.I file
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or the default dictionary cannot be opened.