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awk命令的例子，awk统计ifconfig命令输出的网络配置信息中的网卡接口与ip地址，awk命令与sub函数的用法。 在linux系统中，用ifconfig命令查看网络配置信息（：ifconfig命令实例教程）
[root@mail log]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:0F:1F:6E:65:25 inet addr:172.16.2.12 Bcast:172.16.2.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:60609641 errors:0 dropped:0 overruns:0 frame:0 TX packets:63241643 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1877695464 (1790.7 Mb) TX bytes:2810452038 (2680.2 Mb) Interrupt:16 eth0:0 Link encap:Ethernet HWaddr 00:0F:1F:6E:65:25 inet addr:172.16.2.13 Bcast:172.16.2.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:16 eth0:1 Link encap:Ethernet HWaddr 00:0F:1F:6E:65:25 inet addr:172.16.2.14 Bcast:172.16.255.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) Interrupt:16
打印结果：
[root@mail log]# ifconfig | awk '/eth/{inter=$1;getline;sub(/inet addr:/,"");print inter,$1}'
eth0 172.16.2.12 eth0:0 172.16.2.13 eth0:1 172.16.2.14
其中有getline读取下一行，sub函数。
[root@mail log]# ifconfig | awk '/eth/{inter=$1;getline;split($2,x,":");print inter,x[2]}'
eth0 172.16.2.12 eth0:0 172.16.2.13 eth0:1 172.16.2.14 以上命令中使用了split函数，把$2字段addr:172.16.2.13用split用于:分界符，存储在两个数组中。 (责任编辑：IT) |