CentOS 7.0 - man page for systemd-ask-password (centos section 1)

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

       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

       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

       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:

       -h, --help
	   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

	   Specify the query timeout in seconds. Defaults to 90s. A timeout of 0 waits

	   Never ask for password on current TTY even if one is available. Always use agent

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

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

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

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

	1. systemd Password Agent Specification

	2. XDG Icon Naming Specification

systemd 208								  SYSTEMD-ASK-PASSWORD(1)
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