Adding file commands like MV to FogOS

[AlexBareli]

I would like to add the ability to move files to new directories since it is something that is missing from FogOS. Let me know how I should approach this, or if a command like copy or pwd will be easier.

[malensek]

This would be okay if you implement all 3 of mv, cp, and pwd. My rationale is all 3 are pretty easy to implement:

• mv: link + unlink system calls (we can chat about this if you want because we haven't learned about link/unlink yet)
• cp: read + write system calls
• pwd: add a system call to get the CWD of a process, pass buffer to system call and have it populate it, print buffer

If you don't want all 3 (just the basics) then maybe you can research some extra flags to support for these.