PASSWD(1) PASSWD(1) (NAME) passwd - (SYNOPSIS) passwd [] [LOGIN] (DESCRIPTION) passwd . (superuser) . passwd . . . . . . passwd . . . . : o o o (erase) (kill) . passwd . . UNIX NBS DES . ( ENCRYPT_METHOD). . . . . . http://en.wikipedia.org/wiki/Password_strength . (OPTIONS) passwd : -a, --all -S . -d, --delete ( ). . . -e, --expire . . -h, --help . -i, --inactive INACTIVE . INACTIVE . -k, --keep-tokens () . . -l, --lock . ( '!' ). . ( SSH) . usermod --expiredate 1 ( 2 Jan 1970 ). . -n, --mindays MIN_DAYS MIN_DAYS. . -q, --quiet . -r, --repository REPOSITORY REPOSITORY -R, --root CHROOT_DIR CHROOT_DIR CHROOT_DIR. . -S, --status . . . (L) (NP) (P) . . . . -u, --unlock . ( -l). -w, --warndays WARN_DAYS . WARN_DAYS . -x, --maxdays MAX_DAYS . MAX_DAYS . -1 MAX_DAYS . (CAVEATS) . . NIS NIS . passwd PAM . (FILES) /etc/passwd . /etc/shadow . /etc/pam.d/passwd PAM passwd. (EXIT STATUS) passwd : 0 1 ( ) 2 3 4 passwd 5 passwd 6 (AUTHOR) Julianne Frances Haugh. (REPORTING BUGS) shadow-utils . (COPYRIGHT) (C) 1991 - 1994 Julianne Frances Haugh. (C) 1996 - 2000 Marek Michalkiewicz. (C) 2000 - 2006 Tomasz Kloczko. (C) 2007 - 2025 Nicolas Francois. (SEE ALSO) chpasswd(8), passwd(5), shadow(5), usermod(8). shadow-utils 4.13 12/14/2025 PASSWD(1)