@@ -9,9 +9,10 @@在diff文件中的含義是什麼？

Question

有人可以在下面的示例diff輸出（即以@@開頭的輸出）中解釋第三行嗎？我明白由剩餘的線表示的變化，但我有麻煩的是第三行的感覺......

--- 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)) 

Answer 1

@@ -9,9 +9,10 @@ 

...指定將源文件和目標文件改變發生，通過行號以及正在編輯的塊的大小，在更改之前和之後。

具體來說：

@@ -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. 

也就是說：在原始文件中，大塊被修改由起始於線9 9線;在目標文件中，它是從第9行開始的10行。

請參閱GNU diffutils文檔中的detailed description of unified diff format。