[英]How to add new empty line in place of deleted one when compering using linux diff
I have two files a.txt and b.txt 我有两个文件a.txt和b.txt
a.txt content a.txt内容
a
b
c
b.txt content b.txt内容
a
c
d
I need file c.txt with following content: 我需要具有以下内容的文件c.txt :
a
c
d
File b.txt does not have b line but has extra d line. 文件b.txt没有b行,但具有额外的d行。 File c.txt has empty line in place of missing b and has new line d.
文件c.txt用空行代替缺少的b并用新行d代替。
How can i achive that? 我怎样才能做到这一点?
Here's using sed
to modify the output of diff -u
: 这是使用
sed
修改diff -u
的输出:
$ diff -u a.txt b.txt
--- a.txt 2016-07-26 18:27:59.000000000 +0200
+++ b.txt 2016-07-26 18:28:05.000000000 +0200
@@ -1,3 +1,3 @@
a
-b
c
+d
We'd like to remove the three first lines of that output, then replace every line that starts with a -
with a blank line. 我们想删除该输出的前三行,然后将以
-
开头的每一行替换为空白行。 Finally we need to remove the first character from each remaining line: 最后,我们需要从其余各行中删除第一个字符:
$ diff -u a.txt b.txt | sed -e '1,3d' -e 's/^-.*$//' -e 's/^.//'
a
c
d
This may fail if diff
finds too many similar lines in between the differing lines, in which case it will print a new @@
-line. 如果
diff
在不同行之间发现太多相似行,则可能会失败,在这种情况下,它将打印新的@@
-line。 We may solve this by asking for more lines of unified context with -U
: 我们可以通过使用
-U
请求更多行统一上下文来解决此问题:
$ diff -u -U 100 a.txt b.txt | sed -e '1,3d' -e 's/^-.*$//' -e 's/^.//'
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