User turns:
user: Where is my analysis? Locate any file with analysis in it.
user: Naviagte to that first analysis and identify any line with error in it.
user: Let's bring some order to the project documents. I want to human readible log the storage usage of the entire current directory to usage.txt file. The content of the file should be the number follwed by the word bytes and nothing else.

Involved APIs: GorillaFileSystem
MathAPI
Ground-truth function call path:
GorillaFileSystem.mkdir
GorillaFileSystem.find
GorillaFileSystem.grep
GorillaFileSystem.sort
GorillaFileSystem.tail
GorillaFileSystem.wc
MathAPI.logarithm