Glob returns the names of all files matching pattern or nil if there is no matching file.

RemoveAll removes path and any children it contains.

TempDir creates a new temporary directory in the directory dir with a name beginning with prefix and returns the path of the new directory.

TempFile creates a new temporary file in the directory dir with a name beginning with prefix, opens the file for reading and writing, and returns the resulting *os.File.

WriteFile writes data to a file named by filename in the given filesystem.