plan9-look1
Find lines in a sorted list
Usage
look [-dfnixtc]
[string]
[file]
Overview
Look consults a sorted file and prints all lines that begin with string. It uses binary search.
The following options are recognized. Options dfnt affect comparisons as in sort(1).
-
-i -
Interactive. There is no string argument; instead look takes lines from the standard input as strings to be looked up.
-
-x -
Exact. Print only lines of the file whose key matches string exactly.
-
-d -
`Directory' order: only letters, digits, tabs and blanks participate in comparisons.
-
-f -
Fold. Upper case letters compare equal to lower case.
-
-n -
Numeric comparison with initial string of digits, optional minus sign, and optional decimal point.
-
-t[c] -
Character c terminates the sort key in the file. By default, tab terminates the key. If c is missing the entire line comprises the key.
If no file is specified, /lib/words is assumed, with collating sequence df.
Files
/lib/words
Source
/src/cmd/look.c
Diagnostics
The exit status is ``not found'' if no match is found, and ``no dictionary'' if file or the default dictionary cannot be opened.
Releases
Unchanged in 2 releases since Debian 6.0 (Squeeze).