ODOC: passwd

passwd — Update a user’s authentication details.


Passwd is used to update a user’s authentication tokens, like password, lifetime, etc.. Passwd is configured to work through the Linux-PAM API.


$ passwd — Ask new passwd for your account.

# passwd user1 — Ask new passwd for user1’s account.

# passwd -l user1 — Lock user1 account.

# passwd -u user1 — Unlock user1 account.

# passwd -d user1 — Remove password for user1.

# passwd -S user1 — Show short info about user1’s password.

# passwd -n 30 user1 — Set 30days as the min lifetime of the user1’s password.


All new users should read the following topic in the man page

A) Protect your password & B) Choose a hard-to-guess password.

Read: man passwd, pam

passwd, pam, odoc, linux, gnu/linux