如何获得在linux两个文件之间的差异（只添加）

问题描述

我有两个文件，​​A1和A2（未分类）。 A1是A2的previous版本和部分线路已被添加至A2。我怎样才能被添加到A2的新线路？

I have two files A1 and A2 (unsorted). A1 is previous version of A2 and some lines have been added to A2. How can I get the new lines that are added to A2?

请注意：我只是希望新的线路增加和不想要的是在A1但在A2删除线。当我做差异A1 A2 ，我得到了增加，以及缺失，但我只想补充。

Note: I just want the new lines added and dont want the lines which were in A1 but deleted in A2. When i do diff A1 A2, I get the additions as well as deletions but I want only additions.

请提出一个办法做到这一点。

Please suggest a way to do this.

推荐答案

差异然后的grep 为编辑键入你想要的。

diff and then grep for the edit type you want.

diff -u A1 A2 | grep -E "^\+"

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