4.2. Setting a Password

If you don't already have a password, we recommend you set one. Just enter the command passwd. The command will prompt you for a password and then ask you to enter it a second time to make sure you enter it without typos.

There are standard guidelines for choosing passwords so that they're hard for other people to guess. Some systems even check your password and reject any that don't meet the minimal criteria. For instance, it is often said that you should have at least six characters in the password. Furthermore, you should mix uppercase and lowercase characters or include characters other than letters and digits.