Return currently active, graphical user…

getActiveUser.sh

#!/bin/sh
#
# THanks to https://unix.stackexchange.com/a/394763/146739, there are alos some alternatives
#

# returns all active users currently logged in
getActiveUsers() {
    for sessionid in $(loginctl list-sessions --no-legend | awk '{ print $1 }'); do
        session=$( loginctl show-session "$sessionid" )
        
        # filter not active users 
        if ! echo "$session" | grep "State=active" >/dev/null; then
            continue
        fi
        if ! echo "$session" | grep "Active=yes" >/dev/null; then
            continue
        fi
        
        # filter remote users
        if ! echo "$session" | grep "Remote=no" >/dev/null; then
            continue
        fi
        
        # filter graphical users
        if ! ( echo "$session" | grep "Type=wayland" >/dev/null ) && ! ( echo "$session" | grep "Type=x11" >/dev/null ); then
            continue
        fi
        
        # show active user
        loginctl show-session -p Name --value "$sessionid"
    done
}

for user in $( getActiveUsers ); do
    # do something for each active user
    echo "$user"
done