gdm-screenshot - take a picture of the screen
gdm-screenshot [OPTION...]
gdm-screenshot is a utility for taking screenshots of the entire screen and saving them as PNG image files.
Help Options:
Show help options
Show all help options
Show GTK+ Options
Application Options:
Debugging output
X display to use
gdm3 (8).
gdm-screenshot is part of the GDM software package, which is part of the GNOME project. This manpage was written by Nathan Handler <nhandler@ubuntu.com> for the Debian system, but may be used by others.