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@takakabe

takakabe/address.sh

Last active Dec 12, 2017
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ShellScript
#!/bin/bash
# IPアドレスを2進数に変換する
# 実行例
# $ ./address.sh 172.24.140.1/26
# Netmask: 11111111 11111111 11111111 11000000
# Address: 10101100 00011000 10001100 00000000
address=${1}
octet1=`echo "${address}" | awk -F"." '{print $1}'`
octet2=`echo "${address}" | awk -F"." '{print $2}'`
octet3=`echo "${address}" | awk -F"." '{print $3}'`
octet4=`echo "${address}" | awk -F"." '{print $4}'`
netmask=`echo "${address}" | awk -F"/" '{print $2}'`
octet1_bin=`echo "obase=2; ibase=10;" ${octet1}| bc`
octet1_bin=`printf %08d ${octet1_bin}`
octet2_bin=`echo "obase=2; ibase=10;" ${octet2}| bc`
octet2_bin=`printf %08d ${octet2_bin}`
octet3_bin=`echo "obase=2; ibase=10;" ${octet3}| bc`
octet3_bin=`printf %08d ${octet3_bin}`
octet4_bin=`echo "obase=2; ibase=10;" ${octet4}| bc`
octet4_bin=`printf %08d ${octet4_bin}`
for i in `seq 1 32`
do
if [ ${i} -le ${netmask} ]
then
netmask_bin+="1"
else
netmask_bin+="0"
fi
if [ $(( i % 8 )) = 0 ]
then
netmask_bin+=" "
fi
done
echo "Netmask: ${netmask_bin}"
echo "Address: ${octet1_bin} ${octet2_bin} ${octet3_bin} ${octet4_bin}"
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