shell脚本中如何实现scp传输?

示例脚本如下:

#! /bin/sh
expect -c "
    spawn scp -r /home/jello/jello.txt jello@110.110.110.110:/home/jello/ 
    expect {
        "*assword" {set timeout 20; send "jello
"; exp_continue;} #此处的jello为密码，自行替换
    }
expect eof"