os.system('ls')
#返回结果0或者1，不能得到命令的输出

output = os.popen('ls')

print output.read()
#打印出的是命令输出，但是得不到执行的返回值

(status, output) = commands.getstatusoutput('ls')

print status, output
#打印出返回值和命令输出

 '''

 Created on Dec 10, 2014

 @author: liufei

 '''

 #coding=utf-8

 import time, sched, os, string

 from datetime import datetime

 import MySQLdb

 s = sched.scheduler(time.time,time.sleep)

 def event_func():

     try:

         #主机名

         name = os.popen(""" hostname """).read()

         #cpu数目

         cpu_num = os.popen(""" cat /proc/cpuinfo | grep processor | wc -l """).read()

         #内存大小

         mem = os.popen(""" free | grep Mem | awk '{print $2}' """).read()

         #机器品牌

         brand = os.popen(""" dmidecode | grep 'Vendor' | head -1 | awk -F: '{print $2}' """).read()

         #型号

         model = os.popen(""" dmidecode | grep 'Product Name' | head -1 | awk -F: '{print $2}' """).read()

         #磁盘大小

         storage = os.popen(""" fdisk -l | grep 'Disk /dev/sd' | awk 'BEGIN{sum=0}{sum=sum+$3}END{print sum}' """).read()

         #mac地址

         mac = os.popen(""" ifconfig -a | grep HWaddr | head -1 | awk '{print $5}' """).read()

         name = name.replace("\n","").lstrip()

         cpu_num =  cpu_num.replace("\n","").lstrip()

         memory_gb = round(string.atof(mem.replace("\n","").lstrip())/1000.0/1000.0, 1)

         brand = brand.replace("\n","").lstrip()

         model = model.replace("\n","").lstrip()

         storage_gb = storage.replace("\n","").lstrip()

         mac = mac.replace("\n","").lstrip()

         print name

         print cpu_num

         print memory_gb

         print storage_gb

         print brand

         print model

         print mac

         conn=MySQLdb.connect(host='xx.xx.xx.xx',user='USERNAME',passwd='PASSWORD',db='DBNAME',port=3306)

         cur=conn.cursor()

         cur.execute('select mac from servers where mac=%s',mac)

         data = cur.fetchone()

         if data is None:

             value = [name, brand, model, memory_gb, storage_gb, cpu_num, mac, datetime.now(), datetime.now()]

             cur.execute("insert into servers(name, brand, model, memory_gb, storage_gb, cpu_num, mac,  created_at, updated_at) values(%s, %s, %s, %s, %s, %s, %s, %s, %s)",value)

         else:

             value1 = [name, brand, model, memory_gb, storage_gb, cpu_num, datetime.now(), mac]

             cur.execute("update servers set name=%s,brand=%s,model=%s,memory_gb=%s,storage_gb=%s,cpu_num=%s, updated_at=%s where mac=%s",value1)

         conn.commit()

         cur.close()

         conn.close()

     except MySQLdb.Error,e:

         print "Mysql Error %d: %s" % (e.args[0], e.args[1])

 def perform(inc):

     s.enter(inc,0,perform,(inc,))

     event_func()

 def mymain(inc=10):

     s.enter(0,0,perform,(inc,))

     s.run()

 if __name__ == "__main__":

     mymain()