Bash shell-script implementation of SuperGenPass password generation
Default <length> is 10, which is also the original SuperGenPass default length.
The <domain> parameter is also optional, but it does not make much sense to omit it.
supergenpass.sh will ask for your master password interactively, and it will not be displayed on your terminal.
Since it is a 24-line shell script, it is quite straightforward to just hardcode it in the script itself,
if you don't mind the security compromise.