display lines beginning with a given
look utility displays any lines in
file which contain string as a
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
look utility exits 0 if one or more
lines were found and displayed, 1 if no lines were found, or >1 if an
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
look command appeared in
Version 7 AT&T UNIX.