How to disable a user account in Linux

In Linux, how to disable a user account-general Linux technology-Linux technology and application information is as follows. In Linux, use/etc/shadow to save the encrypted user password. The fastest way to disable an account is to modify the password stored in/etc/shadow, A valid Linux User usually has the following line in/etc/shadow:

User: $1 $ eFd7EIOg $ eeck6xgktwsugi2pgupk.: 13852: 0: 99999: 7 :::

Each field is separated by a colon. The second field is the user password information. If we change the second value to an asterisk * or an exclamation point! This account is disabled and users cannot use this account to log on to the system:

User: *: 13852: 0: 99999: 7 :::

Here I will introduce a simpler method:

Sudo passwd-l User Name

Disable this account. View/etc/shadow and you will find that a exclamation point is added before the password.

Re-enable this account using the following command:

Sudo passwd-u User Name