10564b1175
groff 1.23.0 added .MR to its -man macro package. The NEWS file states
that the inclusion of the macro "was prompted by its introduction to
Plan 9 from User Space's troff in August 2020." From d32deab it seems
that the name for Plan 9 from User Space's implementation was suggested
by groff maintainer G. Brandon Robinson.
Not sure if the intention was to make these definitions compatible, but
it would be nice if they were.
Currently, Plan 9 from User Space's .MR expects its second argument to
be parenthesized. groff's .MR does not. This results in extra
parentheses appearing in manual references when viewing Plan 9 from User
Space's manual pages on a system using groff.
86 lines
1.3 KiB
Groff
86 lines
1.3 KiB
Groff
.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 \*9/src/cmd/look.c
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.SH "SEE ALSO"
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.IR sort (1),
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.MR 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.
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