display lines beginning with a given string
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
The options are as follows:
- Dictionary character set and order, i.e., only alphanumeric characters are
- 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 error occurred.
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.
look command appeared in
Version 7 AT&T UNIX.