[英]Output NUM (default 2) lines of unified context - what does it mean?
我有以下命令:
diff -u filea fileb | grep '^-' | sed 's/^-//' > diff.txt
效果很好; 它将每行差异列表输出到文本文件,然后针对每一行删除'-'的每个实例,但是我真的很想了解-u在做什么以及以下含义:
Output NUM (default 2) lines of unified context
我认为统一是指仅显示差异而不是差异的上下文吗?
在使用上述命令显示两个文件与另一个文件之间的差异方面,我是否应该担心任何潜在的陷阱?
这代表它找到的每个差异周围的“上下文行”数量。
最好用一个例子来说明:
$ diff -U 1 hello.txt hello2.txt
--- hello.txt 2015-01-24 16:10:45.000000000 +0100
+++ hello2.txt 2015-01-24 16:11:14.000000000 +0100
@@ -4,3 +4,3 @@
Hello World.
-Hello World.
+Yo World.
Hello World.
$ diff -U 2 hello.txt hello2.txt
--- hello.txt 2015-01-24 16:10:45.000000000 +0100
+++ hello2.txt 2015-01-24 16:11:14.000000000 +0100
@@ -3,5 +3,5 @@
Hello World.
Hello World.
-Hello World.
+Yo World.
Hello World.
Hello World.
$ diff -U 3 hello.txt hello2.txt
--- hello.txt 2015-01-24 16:10:45.000000000 +0100
+++ hello2.txt 2015-01-24 16:11:14.000000000 +0100
@@ -2,7 +2,7 @@
Hello World.
Hello World.
Hello World.
-Hello World.
+Yo World.
Hello World.
Hello World.
Hello World.
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