review what i studied `date` - 2017-4-4
2017-04-04 22:20
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如果要在第二行即“bbbb”行的上添加一行，内容为“xiaowu”，可以把参数“a”换成“i”
[root@xiaowu shell]# sed '/b/i\xiaowu' file aaaa xiaowu bbbb cccc dddd [root@xiaowu shell]# sed '/bbbb/a\xiaowu' file aaaa bbbb xiaowu cccc bbbb xiaowu dddd #a是after，i是in front消除vim “/” 标记高亮
#消除高亮：键入:noh就可以了。
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