#!/bin/bash #********************************# #2013-01-11 17:00:00 wanggy exp  # #note:ping monitor               # #********************************# set -u ping_fun() {     d_network=192.168.1     echo -n "input the network(default $d_network):"     read network     : ${network:=$d_network}     echo "network:$network"     d_hostip_beg=1     d_hostip_end=254     echo -n "input the hostip(default $d_hostip_beg $d_hostip_end):"     read hostip_beg hostip_end     : ${hostip_beg:=$d_hostip_beg}     : ${hostip_end:=$d_hostip_end}     echo "hostip_beg:$hostip_beg"     echo "hostip_end:$hostip_end"             if [ $hostip_beg -gt $hostip_end ];then                     echo "$hostip_beg greater than $hostip_end!!!"                     exit 0             fi     : >pinglog     : >pingerrlog     ping_count=3     for ((hostip=$hostip_beg;hostip<=$hostip_end;hostip++));do     {             host=$network.$hostip             echo "开始ping检测$host"             ping -c $ping_count $host >/dev/null                     if [ $? = 0 ];then                             echo "$host is up"                             echo "$host is up" >>pinglog                     else                                     echo "$host is down"                                     echo "$host is down" >>pingerrlog                     fi }&    done wait } main() {     echo "----开始执行ping程序----"     ping_fun } main exit 0