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.

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

• Busybox
• PermitRootLogin and PasswordAuthentication in /etc/ssh/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)
• PostgreSQL: ALTER USER user_name WITH PASSWORD 'new_password';
• ssh-keygen -p
• mkpasswd
• macOS:
  • dscl . -passwd
  • passwd yourUsername
  • security set-keychain-password

Activities

• Read https://www.cyberciti.biz/faq/securing-passwords-libpam-cracklib-on-debian-ubuntu-linux/
• macOS: https://support.apple.com/en-us/HT202860

See also

• Hardcoded password
• sudo, visudo, su, passwd, sudo su, Passwordless sudo, /etc/sudoers, /etc/sudoers.d/, /etc/sudoers, sudo --help
• OpenSSH (changelog): /etc/ssh/sshd_config | /etc/ssh/ssh_config | ~/.ssh/ | openSSL | sshd logs | sftp | scp | authorized_keys | ssh-keygen | ssh-keyscan | ssh-add | ssh-agent | ssh | Ssh -O stop | ssh-copy-id | CheckHostIP | UseKeychain, OpenSSF
• passwd, ssh-keygen, chage, /etc/passwd, Password policy, Passwd (package), mkpasswd, cracklib-check, Password cracking, Phone to sign in, Passkey, htpasswd