What is the primary purpose of the passwd command?

The primary purpose of the passwd command is to change a user's password. This command is used in Unix-like operating systems to allow users to update their passwords securely. When a user executes the passwd command, they are prompted to enter their current password followed by the new password they wish to set. The command ensures that the new password meets security requirements and updates the relevant files in the system to reflect this change.

This functionality is vital for maintaining account security and helps protect user data by ensuring that only authorized individuals can access their accounts. The ability to change passwords is an essential administrative task in managing user accounts on a system.