Many a times when you use a tool and ask for --help, it gives a huge listing of options. I have tried grepping and have failed. Can somebody correct me. I am going to use diceware as an example - [$] diceware --help | grep --verbose                                                                                                grep: unrecognized option '--verbose'Usage: grep [OPTION]... PATTERN [FILE]...Try 'grep --help' for more information.close failed in file object destructor:sys.excepthook is missinglost sys.stderri am not sure whether my regular expression is wrong or the question I framed. Can somebody help ?I have tried variation like - [$] diceware --help | grep '--verbose' and still got the same error, could somebody help, much obliged in advance. 
how to use grep when using a $CMD --help | grep though list options?
debian;grep