1.加-n可以把筛选出来的内容的行号打印出来
[root@bee ~]# cat /etc/passwd |grep root -n #打印行号
1:root:x:0:0:root:/root:/bin/bash
10:operator:x:11:0:operator:/root:/sbin/nologin
2.加 -A2 可以把筛选行之后的2行也打印出来
[root@bee ~]# ifconfig |grep eth0 #不加的情况
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
[root@bee ~]# ifconfig |grep eth0 -A2 #加了的情况,(下面就多打印了两行)
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.88.11 netmask 255.255.255.0 broadcast 192.168.88.255
inet6 fe80::1d22:58a1:7a9b:45b2 prefixlen 64 scopeid 0x20<link>
[root@bee ~]#