$ ./ghosh.pl --help This is help message $ ./ghosh.pl --abc --help This is help message $ ./ghosh.pl --abc -help This is help message $ ./ghosh.pl --abc -h This is help message $ ./ghosh.pl --abc --h This is help message $ ./ghosh.pl --abc abc -h This is help message $ ./ghosh.pl --abc abc You have choosen "abc" as abc $ ./ghosh.pl --h This is help message $ ./ghosh.pl -h --abc This is help message