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look(1plan9)

9base

Plan 9 userland tools

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 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

SEE ALSO

DIAGNOSTICS

The exit status is ‘‘not found’’ if no match is found, and ‘‘no dictionary’’ if file or the default dictionary cannot be opened.
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