2 setcap cap_net_bind_service=+ep usr/bin/rcp 2>/dev/null || chmod +s usr/bin/rcp
3 setcap cap_net_bind_service=+ep usr/bin/rlogin 2>/dev/null || chmod +s usr/bin/rlogin
4 setcap cap_net_bind_service=+ep usr/bin/rsh 2>/dev/null || chmod +s usr/bin/rsh