|LOOK(1)||General Commands Manual||LOOK(1)|
look — display
lines beginning with a given string
look utility displays any lines in
file which contain string as a
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:
- Use a binary search on the given word list. If you are ignoring case with
-for 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.
- 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.
LC_CTYPE environment variables affect the
execution of the
look utility. Their effect is
described in environ(7).
- the dictionary
look utility exits 0 if one or more
lines were found and displayed, 1 if no lines were found, and >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 uses a linear search by default
instead of a binary search, which is what most other implementations use by
--alternative flags are ignored for
look utility appeared in
Version 7 AT&T UNIX.
Lines are not compared according to the current locale's collating
order. Input files must be sorted with
set to ‘
|July 17, 2004||Debian|