PINGRET=$( ping www.baidu.com -c 2 | grep "icmp_" );  if [ -z $PINGRET ]; then echo "ping fail"; else echo "ping ok"; fi

ping -c 2 www.baidu.com|grep "icmp_" && echo 'ping ok' || echo 'ping fail'

#!/usr/bin/python # encoding=utf-8 # Filename: net_is_normal.py import os import socket import subprocess #判断网络是否正常 server='www.baidu.com' #检测服务器是否能ping通，在程序运行时，会在标准输出中显示命令的运行信息 def pingServer(server):     result=os.system('ping '+server+' -c 2')     if result:         print '服务器%s ping fail' % server     else:         print '服务器%s ping ok' % server     print result #把程序输出定位到/dev/null,否则会在程序运行时会在标准输出中显示命令的运行信息  def pingServerCall(server):     fnull = open(os.devnull, 'w')     result = subprocess.call('ping '+server+' -c 2', shell = True, stdout = fnull, stderr = fnull)     if result:         print '服务器%s ping fail' % server     else:         print '服务器%s ping ok' % server     fnull.close() #可用于检测程序是否正常，如检测redis是否正常，即检测redis的6379端口是否正常 #检测ssh是否正常，即检测ssh的22端口是否正常 def check_aliveness(ip, port):     sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM)     sk.settimeout(1)     try:         sk.connect((ip,port))         print 'server %s %d service is OK!' %(ip,port)         return True     except Exception:         print 'server %s %d service is NOT OK!'  %(ip,port)         return False     finally:         sk.close()     return False if __name__=='__main__':     pingServerCall(server)     pingServer(server)     check_aliveness('192.168.230.128', 6379)