Shell指令碼比較兩個網段是否存在包含與被包含的關係
阿新 • • 發佈：2018-12-06
設定兩個網段：net1是192.168.10.0/24，net2是192.168.10.128/25。使用Shell指令碼，判斷是net1包含net2還是net2包含net1. 解題思路：
將兩個網段全部轉換為二進位制，且不帶欄位分隔符（即點號），取網路位。如果在net1的二進位制字串裡面擷取到了net2的二進位制字串，則net2包含net1.
#!/bin/bash net1="192.168.10.0/24" net2="192.168.10.128/25" netID1D="`echo $net1 | cut -d "/" -f 1`" netID2D="`echo $net2 | cut -d "/" -f 1`" mask1="`echo $net1 | cut -d "/" -f 2`" mask2="`echo $net2 | cut -d "/" -f 2`" array1D[0]="`echo $netID1D | awk -v FS="." '{print $1}'`" array1D[1]="`echo $netID1D | awk -v FS="." '{print $2}'`" array1D[2]="`echo $netID1D | awk -v FS="." '{print $3}'`" array1D[3]="`echo $netID1D | awk -v FS="." '{print $4}'`" array2D[0]="`echo $netID2D | awk -v FS="." '{print $1}'`" array2D[1]="`echo $netID2D | awk -v FS="." '{print $2}'`" array2D[2]="`echo $netID2D | awk -v FS="." '{print $3}'`" array2D[3]="`echo $netID2D | awk -v FS="." '{print $4}'`" array1B[0]="`echo "obase=2;${array1D[0]}" | bc`" array1B[1]="`echo "obase=2;${array1D[1]}" | bc`" array1B[2]="`echo "obase=2;${array1D[2]}" | bc`" array1B[3]="`echo "obase=2;${array1D[3]}" | bc`" array2B[0]="`echo "obase=2;${array2D[0]}" | bc`" array2B[1]="`echo "obase=2;${array2D[1]}" | bc`" array2B[2]="`echo "obase=2;${array2D[2]}" | bc`" array2B[3]="`echo "obase=2;${array2D[3]}" | bc`" zeroArray=(0 0 00 000 0000 00000 000000 0000000) for ((i=0;i<${#array1B[$i]};i++)) do zeroNum=$((8 - ${#array1B[$i]})) if [ $zeroNum -gt 0 ] then testStr="`awk -v zero="${zeroArray[$zeroNum]}" -v rawStr="${array1B[$i]}" 'BEGIN {printf "%s%s",zero,rawStr}'`" array1B[$i]=$testStr fi done for ((i=0;i<${#array2B[$i]};i++)) do zeroNum=$((8 - ${#array2B[$i]})) if [ $zeroNum -gt 0 ] then testStr="`awk -v zero="${zeroArray[$zeroNum]}" -v rawStr="${array2B[$i]}" 'BEGIN {printf "%s%s",zero,rawStr}'`" array2B[$i]=$testStr fi done netID1B=${array1B[0]}${array1B[1]}${array1B[2]}${array1B[3]} netID2B=${array2B[0]}${array2B[1]}${array2B[2]}${array2B[3]} netID1BNo0="`awk -v inNet="$netID1B" -v inMask="$mask1" 'BEGIN {print substr(inNet,1,inMask)}'`" netID2BNo0="`awk -v inNet="$netID2B" -v inMask="$mask2" 'BEGIN {print substr(inNet,1,inMask)}'`" echo -e "net1十進位制為:$net1\tnet1二進位制為:$netID1BNo0" echo -e "net2十進位制為:$net2\tnet2二進位制位:$netID2BNo0" netVS1="`awk -v inNet1="$netID1BNo0" -v inNet2="$netID2BNo0" 'BEGIN {print index(inNet1,inNet2)}'`" netVS2="`awk -v inNet2="$netID1BNo0" -v inNet1="$netID2BNo0" 'BEGIN {print index(inNet1,inNet2)}'`" if [ $netVS1 -ne 0 ] then echo "計算結果:$net2 包含 $net1" fi if [ $netVS2 -ne 0 ] then echo "計算結果:$net1 包含 $net2" fi
執行結果
[[email protected] ~]# sh netCal.sh
net1十進位制為:192.168.10.0/24 net1二進位制為:110000001010100000001010
net2十進位制為:192.168.10.128/25 net2二進位制位:1100000010101000000010101
計算結果:192.168.10.0/24 包含 192.168.10.128/25