expect登陆linux执行ifconfig示例

    #!/usr/bin/expect

    set VMIP [lindex $argv 0]
    set USER [lindex $argv 1]
    set PASS [lindex $argv 2]
    set timeout 20

    spawn ssh-keygen -R $VMIP
    spawn ssh $USER@$VMIP

    expect {
    eof { exit -1 }
    timeout { send_user "timeout\n"
              exit -1
            }
    "Are you sure you want to continue connecting (yes/no)?" {send "yes\r"}
    "$USER@$VMIP's"
    }
    expect {
        "Permission denied, please try again." { 
            send_user "Permission denied, please try again.\n"
            exit -1
        }
        "password:" {
            send "$PASS\n"
            exp_continue
        }
        "# " {
            send "ifconfig\r"
            expect "# " { send "exit\r"
                        exit 0
                        }
        }
    }