code: 9ferno

ref: e81c54ba2ecc673a4d5f8aed0e9b52841fe07b0d
dir: /man/1/look/

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.TH LOOK 1
.SH NAME
look \- find lines in a sorted list
.SH SYNOPSIS
.B look
[
.BI -dfnix
] [
.BI -r " endkey"
] [
.BI -t 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 recognised:
.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 -r " endkey"
Limit the range of matching values, to include
the word
.I endkey
but no larger values.
.TP
.BR -t [ \f2c\f1 ]
Character
.I c
terminates the sort key in the
.IR file .
By default, tab terminates the key.  If
.I c
is missing the entire line comprises the key.
.PP
If no
.I file
is specified,
.B /lib/words
is assumed, with collating sequence
.BR df .
.SH FILES
.B /lib/words
.SH SOURCE
.B /appl/cmd/look.b
.SH "SEE ALSO"
.IR sort (1), 
.IR grep (1)
.SH DIAGNOSTICS
The exit status is
.B \&"not found"
if no match is found, and
.B \&"no dictionary"
if
.I file
or the default dictionary cannot be opened.