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Bash script to use an Android device as a second monitor for Linux. See https://blog.8bitbuddhism.com/2019/12/01/how-to-use-your-android-tablet-as-second-monitor/ for detailed instructions.
#!/bin/bash
# Make sure your Android device is plugged in and accessible over adb.
#### Remember to enable virtual displays in xorg by adding the following to your configuration (e.g. /usr/share/X11/xorg.conf.d/20-virtual.conf)
# Section "Device"
# Identifier "intelgpu0"
# Driver "intel"
# Option "VirtualHeads" "1"
#EndSection
#### If you use AMD or Nvidia, change the Identifier and Driver options to match your GPU.
W=1920 # Virtual display width
H=1080 # Virtual display height
O=VIRTUAL1 # The name of the virtual display (check using xrandr)
P=eDP1 # The name of your physical display (check using xrandr)
PW='$(xrandr --current | grep \* | awk '{print $1;}' | cut -d x -f 1)'
# Create the virtual display
gtf $W $H 60 | sed '3q;d' | sed 's/Modeline//g' | xargs xrandr --newmode
gtf $W $H 60 | sed '3q;d' | sed 's/Modeline//g' | awk '{print $1;}' | sed 's/^.\(.*\).$/\1/' | xargs xrandr --addmode $O
gtf $W $H 60 | sed '3q;d' | sed 's/Modeline//g' | awk '{print $1;}' | sed 's/^.\(.*\).$/\1/' | xargs xrandr --output $O --right-of $P --mode
# Forward the VNC port to your device and start a VNC session
adb reverse tcp:5900 tcp:5900
x11vnc -localhost -clip ${W}x${H}+${PW}+0
# When the session ends, turn off the virtual display
xrandr --output $O --off
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