CMPS 105
Spring 2005
Due Wednesday, 5/4/05, at midnight

Implement a local (i.e. non-networked) version of rsync, that
synchronizes two file hierarchies specified on the command line.

> mysync dir1 dir2

mysync should compare all of the files in dir1 and dir2 and, for each
pair of files, if one version has changed, would replace the older one
with the newer one.  Each time a replacement is made, print out all
relevant information such as dates, sizes, etc.  

Your program does not have to support all of the command line options
specified in the rsync man page, but may support any that you think
make sense for your implementation.

Make your solution as efficient as you can.

Questions/discussion:
1. Discuss ways that the performance of your program could be
   improved, regardless of whether or not you have implemented them.

2. Discuss how you could modify your solution to efficiently recognize
   and deal with a situation where a directory was copied, and then
   both copies of a file were modified after the split.

3. Discuss what would have to be done to network your solution.

4. Discuss what performance impact networking would have on your
   solution, and how to mitigate that impact.

5. Discuss how you could change the program to allow it to work
   automatically every time a portable computer (e.g. my laptop) is
   connected to the network?  Be sure to consider the performance
   implications of this modification, and discuss how they might be
   addressed.