Generating Patch for NS-2

If you need to generate a patch file for a set of file(s) residing in a directory structure or just for one file, then you can use "diff" command. You can find a very nice article in Linux Magazine named "What's the diff?". Basically, this command finds out the difference between two files.

If you want to generate a patch for a directory structure:
diff -rau "old_dir" "modified_dir" > "patch_file"

r: recursive
a: treat all files as text.
u: Output NUM (default 3) lines of unified context.
In case of two file, ignoring -r would be enough.

For more details please go to http://docs.moodle.org/dev/How_to_create_a_patch