![]() Set the minimum number of days between password changes to MIN_DAYS. Users with a locked password are not allowed to change their password. This option sets the account's expiration date to a date in the past - namely Jan 2, 1970. To disable the account, the superuser can use the usermod command with the option -expiredate 1. The user may still be able to log in using another authentication method (an SSH key, for example). Note that this does not disable the account. ![]() It does this by adding a character at the beginning of the encrypted password. This option disables a password by changing it to a value which matches no possible encrypted value. Indicates that this user's password should only be changed if it has expired. After a user account has had an expired password for integer INACTIVE days, the user may no longer sign on to the account. This option is used to disable an account after the password was expired for many days. This forces a user to change their password the next time they log in.ĭisplay information about how to use the passwd command. Immediately expire an account's password. This option is a quick way to disable logins for an account, without disabling the account itself. This option won't work if used without -S.ĭelete a user's password (make it empty). When used with -S (see below), this option shows the password status for all users. The following options change the way passwd operates: -a, -all As a general guideline, passwords should consist of at least 6 characters, including one or more of each of the following: Next, the password is tested for complexity. Both entries must match for passwd to continue. Otherwise, the user is then prompted twice for a replacement password. If not, passwd refuses to continue, and exits. (The superuser can bypass this step when changing another user's password.)Īfter the current password is verified, passwd checks to see if the user is allowed to change their password at this time. passwd can also change or reset the account's validity period - how much time can pass before the password expires and must be changed.īefore a normal user can change their password, they must first enter their current password for verification. A normal user can only change the password for their account, but the superuser can change the password for any account. The passwd command changes passwords for user accounts. This page covers the Linux version of passwd. A normal user can run passwd to change their password, and a system administrator (the superuser) can use passwd to change another user's password, or define how that account's password can be used or changed. On Unix-like operating systems, the passwd command is used to change the password of a user account.
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