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The passwd command in Linux and Unix-like systems like FreeBSD is used to change a user's password. It's used to set or update the password for a user account. It can also be used to lock or unlock a user account, or to change the password aging information.

Here are a few examples of how the passwd command can be used in Linux and FreeBSD:

1. Change the password for the current user: passwd
2. Change the password for a specific user: passwd username

The passwd command without any options will change the password for the current user. While passwd followed by a username will allow you to update the password for another user.

It's important to note that only the superuser (root) or users with appropriate permissions can use the passwd command to change a user's password. It's also important to keep in mind to use a strong password for security reasons, and to change it regularly.

When choosing a password, it's important to select a strong, unique one that is difficult for others to guess. Here are some tips to help you create a secure password:

1. Use a long password: A longer password is generally more secure than a shorter one. Aim for at least 8 characters.
2. Include a mix of characters: Use a combination of uppercase and lowercase letters, numbers, special characters like !@#$%^&*()-=+ and others.
3. Avoid using personal information: Do not use information that can be easily guessed or found online (on social media platforms), such as your name, birthdate, street name, college name, or your pet's name.
4. Avoid using common words or phrases: Do not use common words or phrases that can be found in the dictionary. Malicious actors are using scripts or bots with dictionaries to brute force their way in.
5. Use a password manager: Use a password manager to store your passwords securely and generate random and strong password for you.

It is also important to change your passwords periodically and use different passwords for different accounts. By including special characters in your password, you increase the complexity and difficulty of guessing it by malicious actors.