python 操作 ssh

#coding:utf-8
"""
    ssh操作例子 实现了服务器日志下载
    2012-08-24
    yywolf
"""
import paramiko
import time
 
hostname="????"
port=22
username="app"
password="????"
if __name__=="__main__":
#    paramiko.util.log.log_to_file('paramiko.log')
    s = paramiko.SSHClient()
    s.load_system_host_keys()
    s.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    s.connect(hostname,port,username,password,timeout=4)
    stdin,stdout,stderr = s.exec_command("sh ~/log/check")
    print stdout.read()
    s.close()
     
     
    #sftp
    t = paramiko.Transport((hostname,port))
    t.connect(username=username,password=password)
    sftp = paramiko.SFTPClient.from_transport(t)
    files = sftp.listdir("/home/app/log/")
    for f in files:
        print f
     
    filetime = time.strftime('%Y-%m-%d',time.localtime(time.time()))
    #需要下载的文件 和下载后的文件名
    sftp.get("/home/app/log/server.txt","C:\\Users\\Administrator\\Desktop\\server.txt")    
    sftp.get("/home/app/log/"+filetime+".log.zip","C:\Users\Administrator\Desktop\\"+filetime+".log.zip")
     
    #RASkey
    pkey_file = "E:\\yy\\tools\\key\\rsa.txt"
    key = paramiko.RSAKey.from_private_key_file(pkey_file)
    s = paramiko.SSHClient()
    s.load_system_host_keys()
    s.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    s.connect(hostname,port,username,pkey=key)
    stdin, stdout, stderr = s.exec_command("ls -l /home/app/log")
    print stdout.read()
    s.close()
 
    raw_input()