Diff 这行是什么？@-9,9+；9,10@@在差异文件中是什么意思？

请有人解释一下下面示例

diff

输出中的第三行（即以@@开头的那一行）好吗？我理解其余几行所代表的变化，但我很难理解第三行的含义

--- a/code/c-skeleton/Makefile
+++ b/code/c-skeleton/Makefile
@@ -9,9 +9,10 @@
 TEST_SRC=$(wildcard tests/*_tests.c)
 TESTS=$(patsubst %.c,%,$(TEST_SRC))

…通过行号和正在编辑的块的大小（更改前后）指定源文件和目标文件中发生更改的位置

具体而言：

@@ -9,9 +9,10 @@
^  ^^ ^ ^^ ^
|  || | || \----- The "10" is the number of lines in the hunk after being
|  || | ||        modified; this patch, then, must add a line, since the
|  || | ||        new count (of 10) is longer than the old count (of 9).
|  || | |\------- This "9" is the line number in the new file where the
|  || | |         modified hunk is placed.
|  || | \-------- This "+" is a hint that the following numbers refer to
|  || |           the new file, after modification.
|  || \---------- This "9" is the number of lines in the hunk before being
|  ||             modified.
|  |\------------ This "9" is the line number in the original file.
|  \------------- This "-" is a hint that the following numbers refer to the
|                 original file.
\---------------- This "@@" is a marker indicating that this is the start of a
                  new hunk.

也就是说：在原始文件中，正在修改的hunk由9行组成，从第9行开始；在目标文件中，从第9行开始有10行

---

请参阅GNU diffutils文档中的。

谢谢，这太棒了。我非常感谢GNU文档的链接。目前我正在阅读一本介绍性的C语言书，在这一章中，作者引用了一个diff文件，几乎没有关于各种diff文件格式的上下文；我的谷歌搜索在

patch vs.diff

上找到了大量的页面，这是没有帮助的…因此我提出了一个基本的问题。。。但是这个图表非常清楚！

@@ -9,9 +9,10 @@
^  ^^ ^ ^^ ^
|  || | || \----- The "10" is the number of lines in the hunk after being
|  || | ||        modified; this patch, then, must add a line, since the
|  || | ||        new count (of 10) is longer than the old count (of 9).
|  || | |\------- This "9" is the line number in the new file where the
|  || | |         modified hunk is placed.
|  || | \-------- This "+" is a hint that the following numbers refer to
|  || |           the new file, after modification.
|  || \---------- This "9" is the number of lines in the hunk before being
|  ||             modified.
|  |\------------ This "9" is the line number in the original file.
|  \------------- This "-" is a hint that the following numbers refer to the
|                 original file.
\---------------- This "@@" is a marker indicating that this is the start of a
                  new hunk.