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:
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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