systemd-ask-password — Query the user for a system password
systemd-ask-password [OPTIONS...] [MESSAGE]
systemd-ask-password may be
used to query a system password or passphrase from the
user, using a question message specified on the
command line. When run from a TTY it will query a
password on the TTY and print it to STDOUT. When run
with no TTY or with
--no-tty it will
query the password system-wide and allow active users
to respond via several agents. The latter is
only available to privileged processes.
The purpose of this tool is to query system-wide passwords -- that is passwords not attached to a specific user account. Examples include: unlocking encrypted hard disks when they are plugged in or at boot, entering an SSL certificate passphrase for web and VPN servers.
Existing agents are: a boot-time password agent asking the user for passwords using Plymouth; a boot-time password agent querying the user directly on the console; an agent requesting password input via a wall(1) message; an agent suitable for running in a GNOME session; a command line agent which can be started temporarily to process queued password requests; a TTY agent that is temporarily spawned during systemctl(1) invocations.
Additional password agents may be implemented according to the systemd Password Agent Specification.
If a password is queried on a TTY the user may press TAB to hide the asterisks normally shown for each character typed. Pressing Backspace as first key achieves the same effect.
The following options are understood:
Prints a short help text and exits.
Specify an icon name alongside the password query, which may be used in all agents supporting graphical display. The icon name should follow the XDG Icon Naming Specification.
Specify the query timeout in seconds. Defaults to 90s. A timeout of 0 waits indefinitely.
Never ask for password on current TTY even if one is available. Always use agent system.
If passed accept cached passwords, i.e. passwords previously typed in.
When used in
accept multiple passwords. This will
output one password per
On success 0 is returned, a non-zero failure code otherwise.