look - display lines beginning with a given string
look [-bdf] [-t termchar] string 
The look 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.
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of the look utility. Their effect is described in environ(7).
/usr/share/dict/words the dictionary
The look utility exits 0 if one or more lines were found and displayed, 1 if no lines were found, and >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 uses a linear search by default instead of a binary search, which is what most other implementations use by default.
A look utility appeared in AT&T v7 .
Lines are not compared according to the current locales collating order. Input files must be sorted with LC_COLLATE set to C.
|July 17, 2004||LOOK (1)|