shell并发ping检测（可交互）

重点& 跟wait，这样“并发”的结果是输出结果不是能按顺序，后台返回。 如果需要再排序下。

#!/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