顺序执行你可以使用;来完成
sudo apt-get update;sudo apt-get install some-tool;some-tool
可以从$?环境变量获取上一次命令的返回结果
$ which cowsay>/dev/null && cowsay -f head-in ohch~
$ which cowsay>/dev/null || echo "cowsay has not been install, please run 'sudo apt-get install cowsay' to install"
$ which cowsay>/dev/null && echo "exist" || echo "not exist"
根据给出的 图片我认为不能 切换 && 和 || 的顺序