Capture some or all of an X server screen and save the image to a file. See also:
magick
. More information: https://imagemagick.org/script/import.php.
magick import -window root path/to/output.ps
magick import -window root -display remote_host:screen.display path/to/output.png
xwininfo
into a JPEG image:magick import -window window_id path/to/output.jpg