How to Hide password when invoking sql plus from command promt?

When i try to open sql plus in command prompt window and enter the sqlplus command follwed by username/password@connection string, the password is not hidden.
How do I get it to show **** instead of displaying password characters out?
Also, what is the command to clear screen : when I try cls or clear screen, I get a windows memory exception of somekind and the only option there is to kill the command window.
Any tips on getting around this?
Thanks a lot for your time and help.

user8848256 wrote:
Can you please give more details on how to not enter password when calling sqlplus from command window like you are saying?
I tried this :
sqlplus username/ @connection string -->Hit Enter : it asks for password but does not recognise the connectionstring to connect to.
sqlplus username/ -->Hit Enter: It does same thing again.asks for password but gives tns adapter error after the password is entered.Leave out the slash:
sqlplus username@connect_string

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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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------------------------+
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------|-------| --------|
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>
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