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look

BSD mandoc

NAME

look - display lines beginning with a given string

SYNOPSIS

[-df ] [-t termchar ] string [file ... ]

DESCRIPTION

The utility displays any lines in file which contain string as a prefix.

If file is not specified, the file /usr/share/dict/words is used, only alphanumeric characters are compared and the case of alphabetic characters is ignored.

Options:

-b

Use a binary search on the given word list. If you are ignoring case with -f or ignoring non-alphanumeric characters with -d the file must be sorted in the same way. See sort(1) for more information on sorting files.

-d

Dictionary character set and order, i.e. only alphanumeric characters are compared.

-f

Ignore the case of alphabetic characters.

-t

Specify a string termination character, i.e. only the characters in string up to and including the first occurrence of termchar are compared.

The utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >1 if an error occurred.

FILES

/usr/share/dict/words

the dictionary

SEE ALSO

grep(1), sort(1)

COMPATIBILITY

The original manual page stated that tabs and blank characters participated in comparisons when the -d option was specified. This was incorrect and the current man page matches the historic implementation.

uses a linear search by default instead of a binary search, which is what most other implementations use by default.

HISTORY

A utility appeared in AT&T System v7 .