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()