Slávek Banko composed on 2019-02-05 01:06 (UTC+0100):
First, for XAUTHORITY should be:
XAUTHORITY=/var/run/xauth/A${DISPLAY}-*
This works:
DISPLAY=:0 XAUTHORITY=/var/run/xauth/A${DISPLAY}-msFdGa import -window root iitdm.png
These do not
DISPLAY=:0 XAUTHORITY=/var/run/xauth/A${DISPLAY}-* import -window root iitdm.png
DISPLAY=:0 XAUTHORITY=/var/run/xauth/A${DISPLAY}* import -window root iitdm.png
Of course, the one that does work requires lookup of the content of /var/run/xauth/ after
a reboot.
Second, I do not see in the man page that xwd would
accept the environment
variable XAUTHORITY or option like -auth or -xauth.
I don't know why the URL I was working from used xwd instead of import.
Another URL that fails to provide a way that works, it too is for gdm:
https://www.howtoforge.com/how-to-take-a-screenshot-of-your-login-screen
Search on
kde.org only found shooting desktop with Spectacle, not greeter.
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