The grep command in linux/unix allows you find the keyword you are searching, instead of return a particular line that contains the keyword, it allows you to specify how many lines to return by specifying -A or -B option as below
$ ifconfig | grep -i eth0 -A 5
Will give you 5 lines after the keyword eth0 was hit in the process of search.
$ ifconfig | grep -i eth1 -B 2
Will give you 2 lines before the keyword eth1 was hit in the process of search.