look - Finds lines in a sorted list
look [-df] [-tcharacter] string [file]
The look command prints all lines in a sorted file that begin with string.
-d Uses dictionary order; only letters, digits, tabs, and spaces are used
-f Searches without regard to case; treats uppercase and lowercase as
Ignores character and characters following it in the search string. If
you specify look -tC ABCDE, the string ABCDE would become (in effect)
AB, with CDE being ignored. This option is primarily for shell
scripts, in which more than one string is being processed.
If no file is specified, look searches in the system word list
/usr/share/dict/words, with the options -df assumed by default.
The look command uses binary search.
The -d and -f options affect comparisons as in sort.
In order to use the -f option, you must first sort file with the sort -f
command; otherwise, look displays only lowercase items.
If you do not specify -f, but specify a file (such as
/usr/share/dict/words) that has been sorted with sort -f, look may not pro-
duce any output.
1. To search a sorted file called sortfile for all lines that begin with
the string as, enter:
look as sortfile
2. To search the system word list for all words beginning with smi,
This might result in:
System word list.
Commands: grep(1), sort(1), spell(1)