go应用发布从python的fabic转到shell的expect

有几个小坑，记录一下!

1.避免每次交互等10秒钟

set timeout 1

2.spawn只能有一个.如果是ssh到跳板机，再ssh到生产机，第二个ssh要通过send发送

spawn ssh -p3299 ${USERNAME}@${CONSOLE_IP}    
#部署到${SERVER_1}
expect "*$"
send "scp -P 3299 ${FILENAME}  ${USERNAME}@${SERVER_1}:${DIR}\r"
expect "*$"
send "\r"
send "ssh ${USERNAME}@${SERVER_1}\r"

3.因为expect是Tcl语法,有些特殊字符,需要特殊处理

#send "ps aux |grep bigdata_linux_amd64 | grep -v grep |awk '{print $2}'|xargs kill -9\r" 会报错!
#因为expect是Tcl语法，所以要将shell的"" 改成Tcl's {}
#因为是两层ssh 所以需要在$前加\
#\r要单独作为一个命令发送
send {ps aux |grep bigdata_linux_amd64 | grep -v grep |awk '{print \$2}'|xargs kill -9}
send "\r"

参考1：http://blog.youkuaiyun.com/leexide/article/details/17485451

参考2: http://stackoverflow.com/questions/12976083/trouble-with-a-terminal-command-using-expect-to-send-this

参考3: http://maomaochong.blog.51cto.com/9260445/1690753