使用Expect自动执行ssh密码检查

Question

我正在尝试自动执行scp命令的密码检查，我正在使用Expect命令，但是我并没有直接向服务器发送访问权限，而是试图从中复制文件，所以密钥是不可行的。

ive尝试了此帖子的答案 Using expect to pass a password to ssh

#!/usr/bin/expect
spawn sftp -b cmdFile user@xxx.xxx.xxx.xxx
expect "password:"
send -- "root"
interact

我遇到以下错误

line 2: spawn: command not found
couldnt read file "password":no such file or directory
line 4: send: command not found
line 5: interact: command not found