look.1

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)look.1	8.1	9/11/90
.TH look 1
.SH Name
look \- find lines in sorted data
.SH Syntax
.B look
[\fB\-df\fR] \fIstring\fR [\|\fIfile\fR\|]
.SH Description
.NXR "look command"
.NXR "file" "finding pattern"
.NXA "grep command" "look command"
.NXA "sort command" "look command"
The
.PN look
command consults a sorted
.I file
and prints all lines that begin with
.IR string .
It uses binary search.
B
.SH Options
The options 
.B d
and
.B f
affect comparisons as in
.MS sort 1 .
If no
.I file
is specified, 
.PN /usr/dict/words
is assumed with collating sequence
.B \-df.
.IP \fB\-d\fR 5
Uses dictionary order:
only letters, digits,
tabs and blanks can be compared.
.IP \fB\-f\fR 
Folds uppercase to lowercase (compares equally).   
.SH Files
/usr/dict/words
.SH See Also
grep(1), sort(1)