Question on interpreting Hunk in a patch

["sahlot arvind" <asahlot@xxxxxxxxx>]

Hi All,

 

How to interpret hunk in patch?

 

a.txt

-----

this is first line
this is second line
this is third line
and this is last line
 

 

b.txt

------

this is first line
this is second line
this line is inserted
this is third line
and this is last line
 

 

I did "diff -up a.txt b.txt > patch"

I get -

 

patch

-------

--- a   2008-01-11 17:08:58.000000000 +0530
+++ b   2008-01-11 17:09:15.000000000 +0530
@@ -1,5 +1,6 @@
 this is first line
 this is second line
+this line is inserted
 this is third line
 and this is last line
 

---------------------------------------------

 

In the hunk of this patch - what is the meaning of these numbers?

 

Thanks