look – find lines in a sorted list|
look [ −dfnixtc ] [ string ] [ file ]|
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
−d ‘Directory’ order: only letters, digits, tabs and blanks participate
−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
If no file is specified, /lib/words is assumed, with collating
The exit status is “not found” if no match is found, and “no dictionary”
if file or the default dictionary cannot be opened.|