# adduser newuser

#!/bin/bash

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$ su newuser

newuser@myPC:~$ /home/myregularuser/macro.bash
No protocol specified
Error: Can't open display: (null)
Failed creating new xdo instance

if xhost >& /dev/null; then
   echo "export DISPLAY="$DISPLAY"" > $HOME/.display
fi

#!/bin/bash

source $HOME/.display

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newuser@myPC:~$ /home/myregularuser/macro.bash

regularuser@myPC:~$ source /home/newuser/.display # Setting $DISPLAY as the newuser $DISPLAY value
regularuser@myPC:~$ su newuser -c "xauth extract /home/newuser/.Xauthority $DISPLAY" | xauth merge
xauth: (argv):1:  bad "merge" command line
Password:
xauth:  timeout in locking authority file /run/user/1000/gdm/Xauthority

su newuser -c "xauth extract /home/newuser/.Xauthority $newuserDISPLAY" | xauth merge