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, ignores case