Blog-Thread: Creating a Shell Wrapper and Runtime Modifier (SWARM) Post: 303045406

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LEARN ABOUT DEBIAN

systemd-ask-password

SYSTEMD-ASK-PASSWO(1)					       systemd-ask-password					     SYSTEMD-ASK-PASSWO(1)

NAME

       systemd-ask-password - Query the user for a system password

SYNOPSIS

       systemd-ask-password [OPTIONS...] [MESSAGE]

DESCRIPTION

       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[1].

       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.

OPTIONS

       The following options are understood:

       --h, --help
	   Prints a short help text and exits.

       --icon=
	   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[2].

       --timeout=
	   Specify the query timeout in seconds. Defaults to 90s.

       --no-tty
	   Never ask for password on current TTY even if one is available. Always use agent system.

       --accept-cached
	   If passed accept cached passwords, i.e. passwords previously typed in.

       --multiple
	   When used in conjunction with --accept-cached accept multiple passwords. This will output one password per line.

EXIT STATUS

       On success 0 is returned, a non-zero failure code otherwise.

SEE ALSO

       systemd(1), systemctl(1), plymouth(8), wall(1)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

NOTES

	1. systemd Password Agent Specification
	   http://www.freedesktop.org/wiki/Software/systemd/PasswordAgents

	2. XDG Icon Naming Specification
	   http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html

systemd 							    10/07/2013						     SYSTEMD-ASK-PASSWO(1)