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Only the above method isn't too safe, because you type the password in clear-text, and secondly because it's pretty surely saved into command history of your shell. You can always remove the history file, but I still don't recommend typing passwords in clear-text.
this is one of those things that's nice to know, but not a good idea to actually DO....If you are "very clever", you can make it easy to make a typo in your password and then get locked out of your system.
It strikes me that the solution being discussed will take more time to type than simply entering the password twice.