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LOOK(1) General Commands Manual LOOK(1)

lookdisplay lines beginning with a given string

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

The look utility displays any lines in file which contain string as a prefix. As look performs a binary search, the lines in file must be sorted.

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 options are as follows:

Dictionary character set and order, i.e., only alphanumeric characters are compared.
Ignore the case of alphabetic characters.
Specify a string termination character, i.e., only the characters in string up to and including the first occurrence of termchar are compared.

the dictionary

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

grep(1), sort(1)

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.

The look command appeared in Version 7 AT&T UNIX.

September 3, 2010 OpenBSD-current