//usage: "[-afo] [-n LEN] [FILE]..."
//usage:#define strings_full_usage "\n\n"
//usage: "Display printable strings in a binary file\n"
-//usage: "\nOptions:"
//usage: "\n -a Scan whole file (default)"
//usage: "\n -f Precede strings with filenames"
//usage: "\n -n LEN At least LEN characters form a string (default 4)"