User turns:
user: Locate any file with that a special word in it
user: The special word is analysis
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 readiblelog 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