A summary of options is included below.
-? Show version and usage of program.
-dnn Set debug level to nn.
-dt Print timestamp in debug output
-f<data-file>
The data-file is a filename that contains lines of data to be matched (or not) against one or more
patterns. When the program is run, it will prompt you for a regular expression pattern, then apply
it one line at a time against the data in the file. Each line that matches will be printed
preceded by its line number. You will then be prompted again for another pattern.
-n Print lines that do not match
-l Suppress lines numbers.