Reference: look

look

look *fh, key, dict, fold

Performs string search and sets the position in filehandle fh to the first line with a key equal to or greater than key. Returns the new file position, or -1 in case of error. Takes the following arguments:

fh

Filehandle of the dictionary file.

key

Key to search for.

dict

If true, searches in dictionary order, considering only word characters and whitespace.

fold

If true, ignore case.