Passwd (command)

passwd command included in passwd (package)

• passwd USERNAME

• passwd -l USERNAME // for disabling password login
• passwd -u USERNAME // will unlock account if needed
• passwd --status USERNAME // show status

passwd -u $USERNAME
passwd: password expiry information changed.

Busybox

passwd -u USERNAME
passwd: password for USERNAME changed by root

passwd -u USERNAME
passwd: password for USERNAME is already unlocked

passwd --status USERNAME
USERNAME L 11/15/2020 0 99999 7 -1

journalctl 
Feb 05 14:35:55 SERVER_NAME passwd[29180]: pam_unix(passwd:chauthtok): password changed for root

Related terms

• PermitRootLogin in sshd_config
• PAM
• /etc/passwd (See also Zabbix /etc/passwd trigger)
• jailkit
• libpam_cracklib
• Passwordless sudo
• Lockout policy (Windows)
• Password policy
• openssl passwd
• /etc/systemd/logind.conf
• passwd (package)

Activities

• Read https://www.cyberciti.biz/faq/securing-passwords-libpam-cracklib-on-debian-ubuntu-linux/

See also

• Hardcoded password
• sudo, visudo, passwd, Passwordless sudo, /etc/sudoers
• OpenSSH (changelog), /etc/ssh/sshd_config, /etc/ssh/ssh_config, ~/.ssh/, openSSL, sshd logs, sftp, scp, authorized_keys, ssh-keyscan, ssh-add, ssh-keygen, ssh, Ssh -O stop
• passwd, ssh-keygen, chage, /etc/passwd, Password policy, Passwd (package)