term% cat index.txt LOOK(1) General Commands Manual LOOK(1)
NAME
look - find lines in a sorted list
SYNOPSIS
look [ -dfnixtc ] [ string ] [ file ]
DESCRIPTION
Look consults a sorted file and prints all lines that begin with
string. It uses binary search.
The following options are recognized. Options dfntc 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 `Dictionary' order: only letters, digits, tabs and blanks par‐
ticipate 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.
tc `Tab character' c terminates the sort key in the file.
If no file is specified, /usr/dict/words is assumed, with collating se‐
quence df.
FILES
/usr/dict/words
SEE ALSO
sort(1), grep(1), dict(7)
DIAGNOSTICS
Look returns exit status 0 if string is found, 1 if not found, 2 for
error.
LOOK(1)