通过shell脚本实现子网掩码进制间转换：
数值转换列表可参考：
https://blog.csdn.net/m0_50546016/article/details/113847929
#!/bin/bash
netMask=$1
##maskdigits
maskdigits(){
a=$(echo "$1" | awk -F "." '{print $1" "$2" "$3" "$4}')
for num in $a;
do
while [ $num != 0 ];do
echo -n $(($num%2)) >> /tmp/num;
num=$(($num/2));
done
done
echo $(grep -o "1" /tmp/num | wc -l)
rm -rf /tmp/num
}
maskNum=`echo ${#netMask}`
if [ $maskNum != 2 ]; then
netMask=`maskdigits "$netMask"`
fi
echo $netMask
执行效果：
[root@prod soft]# chmod +x 2.sh
[root@prod soft]#
[root@prod soft]#
[root@prod soft]# ./2.sh 255.255.255.0
24
?
