Display a brief help message. Each word is a contiguous sequence of letters and digits. Single characters and a few common words are also ignored.
Any word ending with an asterisk is treated as a prefix.
Several of these commands may be combined on a single line. Display the results of the previous search. If is omitted, the previous save file is used. If no save file has ever been specified, results are saved in the file specified on the command line. If the save file exists, results are appended to it.