timeout 限制命令执行时间
timeout 5 ping www.baidu.com
timeout 2.5s ping www.baidu.com
timeout 5m ping www.baidu.com
timeout 1d ping www.baidu.com
timeout -s SIGKILL 5s ping www.baidu.com
timeout -s 9 5s ping www.baidu.com
timeout 5 ping www.baidu.com
timeout 2.5s ping www.baidu.com
timeout 5m ping www.baidu.com
timeout 1d ping www.baidu.com
timeout -s SIGKILL 5s ping www.baidu.com
timeout -s 9 5s ping www.baidu.com