一个ping的脚本

#!/bin/sh
trap 'echo "before execute line:$LINENO" >/dev/null' DEBUG
d_buffer=/tmp/ipbuffer
declare -a IP # ip list
test() # test start end
{
        local lsip=$1
 local leip=$2
 local t=0
        echo "testting....."
        while [ $lsip -le $leip ]
        do
        (
                ping -c 1 -w 1 ${IP[$lsip]} >/dev/null 2>&1
                te=`echo $?`
                if [ $te -gt "0" ]
                then
   echo "${IP[$lsip]} lost"> $d_buffer/lost$t.buf
                else
   echo "${IP[$lsip]} ok"> $d_buffer/on$t.buf
                fi
        )&
                ((lsip++))
  ((t++))
        done
        wait
 for ((a=0;a<t;a++))
 do
  if [ -e $d_buffer/on$a.buf ]
  then
   cat $d_buffer/on$a.buf>>error
  fi
 done
 for ((b=0;b<t;b++))
 do
  if [ -e $d_buffer/lost$b.buf ]
  then
   cat $d_buffer/lost$b.buf>>error
  fi
 done
}

:>./error  #Çå¿ÕerrorÎļþ
case $1 in
"-h"|"--help"|"")
        echo -e "Usage:atping [-r] ip_start ip_end\natping 192.168.0.1 192.168.0.254#ping 192.168.0.1-192.168.0.254"
 echo "atping -r                          #read ip from ip.txt "
        ;;
[1-2]*)
 if [ ! -d $d_buffer ]
 then
  mkdir $d_buffer
 fi
 rm /tmp/ipbuffer/* 2&>/dev/null
 startip=$1
 endip=$2
 declare -r sip=${startip##*.}             #  *.*.*.10
 eip=${endip##*.}                         
 ct=$((${endip##*.}-${startip##*.}))       #  *.*.*.10-*.*.*.5
 for ((i=sip;i<=eip;i++))
 do
  IP[$i]=${startip%.*}.$i           #10.10.10.*+10
 
 done
        test $sip $eip
        exist=$(grep "ok" error|wc -l)
        lost=$(grep "lost" error|wc -l)
 cat error
        echo -e "total:$ct\nexist:$exist .lost:$lost"
        ;;

-r)
        IP=($(cat ip.txt))  
        count=`cat ip.txt|wc -l` 
        test 0 $count
        exist=$(grep "ok" error|wc -l)
        lost=$(grep "lost" error|wc -l)
        echo -e "total:$count\nexist:$exist.lost:$lost"
        ;;
*) echo "wrong parameter"
        exit
esac