通过expect实现自动远程登陆的模板

• 学会在shell脚本执行时读取密码而不是把密码直接赋值给一个变量
  read -p "Your Passwd: " -s PASSWARD #变量PASSWARD存放输入的密码

• 在shell中插入使用expect
  expect<<EOF
  ...
  #expect codes...
  EOF

• expect自动登陆不退出
  set timeout 10 #timeout is 10s
  spawn ssh $USER@$SERVER
  expect {
  "(yes/no)?"
  {
  send "yes\n"
  expect "assword:" { send "$PASSWARD"}
  }
  "assword:"
  {
  send "$PASSWARD"
  }
  }
  interact

• expect自动登陆执行指定命令并退出
  spawn ssh $USER@$SERVER
  expect {
  "(yes/no)?"
  {
  send "yes\n"
  expect "assword:" { send "$PASSWARD"}
  }
  "assword:"
  {
  send "$PASSWARD"
  }
  }
  expect "# "
  send "$YOUR_CMD\n"
  expect "$EXPECT_PRINTS"
  send "exit\n"
  expect eof