Abs returns the absolute path for file, based on.

EnsureDirectoryExists makes sure the entire path exists, all parent folders too.

IsDir returns true if path is a directory, will fail otherwise.

IsFile will return true if path is a file.

Join the paths in arguments together and returned the concated path.

JoinAndCreate joins the paths together and makes sure the path exists.

Remove the directory and all its subdirectories.

CachePath is path where tau will store cache items.

TauPath directory where all processing is done.

WorkingDir is directory where user is running command from.