shell版本

#!/bin/bash
m=0
for i in `seq 1 255`
do
  ping -c 1 192.168.1.${i} >/dev/null
  if [ $? -eq 0 ]
  then
      echo 192.168.1.${i} is up
      m=(`expr $m + 1`)
  else
    echo 192.168.1.${i} is down
  fi
done
echo "共有$m主机在线”

python版本多线程

import threading,subprocess,re,time

#定义要匹配的字符串
regex=re.compile("100% packet loss")
class mythread(threading.Thread):
    def __init__(self,sta,end):
        threading.Thread.__init__(self)
        self.sta=sta
        self.end=end
    def run(self):
        for i in range(self.sta,self.end):
            out=subprocess.Popen("ping -c 1 -W 1 192.168.1.%s"%i,stdout=subprocess.PIPE,stderr=subprocess.PIPE,shell=True)
            out=out.stdout.read()
            #匹配输出是否包含regex如果不包含则ping通    
            if len(regex.findall(str(out)))==0:
                print("192.168.1.%s"%i +" is up")
            else:
                print(".",end=" ")
if __name__ == '__main__':
      #可以使用线程池，这个分五个部分使用五个线程同时ping
    print(time.ctime())
    t1=mythread(1,50)
    t2=mythread(50,100)
    t3=mythread(100,150)
    t4=mythread(150,200)
    t5=mythread(200,255)
    for i in t1,t2,t3,t4,t5:
        i.start()
    t1.join()
    t2.join()
    t3.join()
    t4.join()
    t5.join()
    print(time.ctime())

多线程

import threading,time,subprocess,re,queue

regex = re.compile(r'\b0%')
def myping(q):
    if  semaphore.acquire():
        if q.empty():
            return
        else:
            num=q.get()
            ping=subprocess.Popen("ping -c 1 -W 1 192.168.1.%s"% num,stdout=subprocess.PIPE,shell=True)
            if len(regex.findall(str(ping.stdout.read())))!=0:
                print("192.168.1.%s is up"% num)
        semaphore.release()
if __name__ == '__main__':
    q=queue.Queue()
    print(time.ctime())
    semaphore=threading.Semaphore(20)
    for i in range(1,255):
        q.put(i)
    for i in range(256):
        t=threading.Thread(target=myping,args=(q,))
        t.start()
    for i in range(256):
        t.join()
    print(time.ctime())