/bin/bashswitch=br0if[-n"$1"];theniplinkset$1upsleep1brctladdif${switch}$1exit0elseecho“Error:nointerfacespecified”exit1fi1.5使用如下命令行启动qemu虚拟机sudoqemu-system-x86_64-enable-kvm-bootc-drivefile=/usr/local/ubuntu.img,if=virtio-m1024-smp2-netdevtype=tap,script