User turns:
user: Could you go to temp directory, and for each file in there, count the number of lines.
user: Now, scour through the mysterious 'dev_summary.txt' and hunt for any mentions or whispers of 'server error'.
user: Make a new file whose name is the number of line but in txt format and append the second sentence containing 'server error' to it.

Involved APIs: GorillaFileSystem
Ground-truth function call path:
GorillaFileSystem.cd
GorillaFileSystem.echo
GorillaFileSystem.cat
GorillaFileSystem.grep
GorillaFileSystem.tail
GorillaFileSystem.wc