网上关于pexpect的介绍基本都类似于这样http://blog.csdn.net/sdustliyang/article/details/23373485，但是并没有关于下述问题的解释

　　问题：可以ssh到主机，但是后面执行的命令无法生效

　　代码如下：

1 import pexpect  2 import sys 3  4 child = pexpect.spawn('ssh user@ip') 5 fout = file('mylog.txt','w') 6 child.logfile = fout 7  8 child.expect('password:') 9 child.sendline('mypassword')10 11 child.expect('#')12 child.sendline('ls /home')14 child.expect('#') 日志信息：

user@ip's password: mypassword  ######################################################################  #                              Notice                                #  #                                                                    #  #  1. Please DO NOT upgrade the kernel, as the kernel upgrade would  #  #   damage the original operating system.                            #  #                                                                    #  #  2. Please create unique passwords that use a combination of words,#  #   numbers, symbols, and both upper-case and lower-case letters.    #  #   Avoid using simple adjacent keyboard combinations such as        #   #   "Qwert!234","Qaz2wsx",etc.                                       #  #                                                                    #  #  3. Unless necessary, please DO NOT open or use high-risk ports,   #  #   such as Telnet-23, FTP-20/21, NTP-123(UDP), RDP-3389,            #  #   SSH/SFTP-22, Mysql-3306, SQL-1433,etc.                           #  #                                                                    #  #                     Any questions please contact 4000-955-988      #  ######################################################################ls /home

可以看到ssh是成功连接的，但是ls /home命令并没有执行。什么原因呐？我也不知道....网上也找不到