Data Analyst Technical Test

BRIEF

Create a program. This program will:

Accept a string piped from commandline with STDIN. This string is the path to a folder
Verify that the string is correct
Handle both UNIX and Windows pathing
Find every .csv file in the folder and subfolders, and ignore every other file
fail successfully and verbosely if an error occurs
use STDERR to signal failure
Pipe out a list of the csv files that are distinct with STDOUT.
Estimate the efficiency of your program by time and by algorithmic complexity.

This should represent 1 - 2 hours of work.