Linuxshell网络掩码地址转CIDR

例子：

./1.sh 255.255.255.0

./1.sh 255.255.255.128

./1.sh 255.255.0.0

源实现：

#!/bin/bash netmask_to_cidr() { local IFS local -a octets local i=0 local cidr=0 IFS='.' read -r -a octets <<< "$1" for octet in "${octets[@]}"; do while [ $octet -gt 0 ]; do cidr=$((cidr + (octet & 1))) octet=$((octet >> 1)) done done echo "$cidr" } # 将点分十进制格式的子网掩码转换为CIDR格式 netmask=$1 cidr=$(netmask_to_cidr $netmask) echo "子网掩码 $netmask 转换为CIDR格式为: /$cidr"