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look

BSD mandoc

NAME

look - display lines beginning with a given string

SYNOPSIS

[-bdf ] [-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.

The following options are available:

-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. Please note that these options are the default if no filename is given. 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.

ENVIRONMENT

The LANG , LC_ALL and LC_CTYPE environment variables affect the execution of the utility. Their effect is described in environ(7).

FILES

/usr/share/dict/words

the dictionary

EXIT STATUS

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.

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.

SEE ALSO

grep(1), sort(1)

HISTORY

A utility appeared in AT&T System v7 .

BUGS

Lines are not compared according to the current locale's collating order. Input files must be sorted with LC_COLLATE set to `C'