MAX 21 Points

(3 points)
Write a script that prints every user on your system using more than N megabytes  of disk space.  'N' is supplied on the command line.  Remember that command line arguments are things like $1, $2 and $@.  
        Example:
                hogs 20


(3 points)
Write a script that prints all processes using more than 30 megabytes of RAM or more than 20% of the CPU.  


(3 points)
For each file in the current working directory, copy it to a folder called ~/backups.  Don’t do directories.  Don’t do any file such that the corresponding file in ~/backups is newer than the source file.

(8 points)
Write me a script that takes a directory to start in.  It should print all files that meet at least on criteria, and tell me why.  It can list the same file more than once if need be.

• Empty files (exactly zero bytes)

• Empty directories (no contents in the directory)

• Last used more than 1 year

• Files owned by no valid user

• Files owned by root

• .bashrc with world or group write permission

• It's bigger than 10M

• Files that no one can read (hint: This is not -readable)
  
  

Startup Stuff (4 points)

• Run some unique command on start up

• Change your prompt to something no one else in the room has that's cool

• Change your PATH to include something new and useful

• Add a useful unique alias.