TH LOOK 1
SH NAME
look \- 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
B dfnt
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
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 /sys/src/cmd/look.c
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.
