Add this to your .bashrc if you want a toggle function to switch between US and ABNT-2 keyboard layouts on linux.

.bashrc

function toggle_layout {
    currentLayout=$(setxkbmap -query | grep layout | awk '{print $2}')
    if [ "$currentLayout" == "br" ]; then
        setxkbmap us && notify-send -t 1000 "Switched to US Layout"
    else
        setxkbmap br && notify-send -t 1000 "Switched to ABNT-2 Layout"
    fi
}