The look command consults a sorted filename and prints all lines that begin with string.

If no filename is specified, look uses /usr/share/lib/dict/words with collating sequence -df.

look limits the length of a word to search for to 256 characters.

-d

Dictionary order. Only letters, digits, TAB and SPACE characters are used in comparisons.

-f

Fold case. Upper case letters are not distinguished from lower case in comparisons.

-tc

Set termination character. All characters to the right of c in string are ignored.

/usr/share/lib/dict/words

spelling list

See attributes(5) for descriptions of the following attributes:

grep(1), sort(1), attributes(5)