How to Generate Patch in NS-2

Patch 

         In general , patch means a piece of cloth or other material used to mend or strengthen a torn or weak point. In networks , it means to apply the modifications to the existing file. its a kind of diff between existing and modified one. 

 "diff" command is used to generate patch file for directories  in NS-2. Clear Explanation about the patch creation is specified in the article named  "What's the diff?".

 dIff is used to evaluate the difference between the two files. 

 patch for a directory structure command:

diff -rau "old_directory" "modified_directory" > "patch_file"

r: recursive mode
a: All files as text
u: Output NUM (default 3) lines of unified context.

If you taking files difference in to consideration then remove r from the command

      diff -au "old_dir" "modified_dir" > "patch_file"

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