过滤ip或者mac地址

官网地址：https://metacpan.org/pod/Regexp::Common

下载地址：https://cpan.metacpan.org/authors/id/A/AB/ABIGAIL/Regexp-Common-2017060201.tar.gz

安装步骤

wget https://cpan.metacpan.org/authors/id/A/AB/ABIGAIL/Regexp-Common-2017060201.tar.gz
tar xf Regexp-Common-2017060201.tar.gz
cd Regexp-Common-2017060201/
#yum -y install perl-CPAN
#yum install perl-ExtUtils-MakeMake
 perl Makefile.PL
#yum install make -y
make
make install

过滤IPv4

ip a |perl -MRegexp::Common=net -lnE 'say $& if /$RE{net}{IPv4}/g'

过滤IPv6

ip a |perl -MRegexp::Common=net -lnE 'say $& if /$RE{net}{IPv6}/g'

过滤MAC地址

ip a |perl -MRegexp::Common=net -lnE 'say $& if /$RE{net}{MAC}/g'

1 # IPv4过滤常规方法
2 # 1、正则匹配过滤
3 ifconfig | awk '/inet / && $6 ~ /[0-9]/{print$2}' 45 # 2、按照段落读取
6 ifconfig | awk 'BEGIN{RS=""}{print $6}' 78 # 3、注意：多块网卡时，需要排除lo网卡，因为eth0顺序不能保证在第一段
9 ifconfig | awk 'BEGIN{RS="";FS="\n"}!/^lo:/{$0=$2;FS=" ";$0=$0;print $2;FS="\n"};'
10
11 # 4、其他
12 ifconfig $i|grep "inet "|awk '{print $2}'
13 ifconfig | grep "mtu" |awk -F": " '{print $1}'
14 ip add | grep "mtu" |awk -F": " '{print $2}'