passwd: Changes Your Password
If someone else assigned you a password, it is a good idea to give yourself a new one. A good password is seven or eight characters long and contains a combination of numbers, upper- and lowercase letters, and punctuation characters. Avoid using control characters (such as CONTROL-H) because they may have a special meaning to the system, making it impossible for you to log in. Do not use names, words from English or other languages, or other familiar words that someone can easily guess.
For security reasons none of the passwords that you enter is ever displayed by any utility.
security || Protect Your Password
Do not allow someone to find out your password: Do not put your password in a file that is not encrypted, ...
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