less maskdigits.sh

#!/bin/sh

#maskdigits.sh mask 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 /tmp/$$.num

例如：maskdigits.sh 255.255.0.192

            18