password-prompt — Prompt for a password and output it.


password-prompt [ --prefix PREFIX | -p PREFIX ]
[ --prompt PROMPT ] [--debug]

password-prompt { --help | -? }

password-prompt --usage

password-prompt { --version | -V }


All password-prompt does is prompt for a password and output any given password to standard output.

This program is not very useful on its own. This program is really meant to run as a plugin in the Mandos client-side system, where it is used as a fallback and alternative to retrieving passwords from a Mandos server.

This program is little more than a getpass(3) wrapper, although actual use of that function is not guaranteed or implied.

This program tries to detect if a Plymouth daemon (plymouthd(8)) is running, by looking for a /run/plymouth/pid file or a process named plymouthd. If it is detected, this process will immediately exit without doing anything.


This program is commonly not invoked from the command line; it is normally started by the Mandos plugin runner, see plugin-runner(8mandos). Any command line options this program accepts are therefore normally provided by the plugin runner, and not directly.

--prefix=PREFIX, -p PREFIX

Prefix string shown before the password prompt.


The password prompt. Using this option will make this program ignore the CRYPTTAB_SOURCE and CRYPTTAB_NAME environment variables.


Enable debug mode. This will enable a lot of output to standard error about what the program is doing. The program will still perform all other functions normally.

--help, -?

Gives a help message about options and their meanings.


Gives a short usage message.

--version, -V

Prints the program version.


If exit status is 0, the output from the program is the password as it was read. Otherwise, if exit status is other than 0, the program has encountered an error, and any output so far could be corrupt and/or truncated, and should therefore be ignored.



If set, and if the --prompt option is not used, these environment variables will be assumed to contain the source device name and the target device mapper name, respectively, and will be shown as part of the prompt.

These variables will normally be inherited from plugin-runner(8mandos), which might have in turn inherited them from its calling process.

This behavior is meant to exactly mirror the behavior of askpass, the default password prompter from initramfs-tools.


Please report bugs to the Mandos development mailing list: (subscription required). Note that this list is public. The developers can be reached privately at (OpenPGP key fingerprint 153A 37F1 0BBA 0435 987F 2C4A 7223 2973 CA34 C2C4 for encrypted mail).


Note that normally, command line options will not be given directly, but via options for the Mandos plugin-runner(8mandos).

Normal invocation needs no options:


Show a prefix before the prompt; in this case, a host name. It might be useful to be reminded of which host needs a password, in case of KVM switches, etc.


Run in debug mode.

password-prompt --debug


On its own, this program is very simple, and does not exactly present any security risks. The one thing that could be considered worthy of note is this: This program is meant to be run by plugin-runner(8mandos), and will, when run standalone, outside, in a normal environment, immediately output on its standard output any presumably secret password it just received. Therefore, when running this program standalone (which should never normally be done), take care not to type in any real secret password by force of habit, since it would then immediately be shown as output.

To further alleviate any risk of being locked out of a system, the plugin-runner(8mandos) has a fallback mode which does the same thing as this program, only with less features.


intro(8mandos), mandos-client(8mandos), plugin-runner(8mandos), plymouthd(8)