Exit causes the current program to exit with the given status code.

MkdirAll creates a directory named path, along with any necessary parents, and returns nil, or else returns an error.

OpenDevice returns a pointer to the device indicated by name.

OpenFile returns wraps os.OpenFile.

Remove removes the named file or (empty) directory.

Stat stats the given resource.

append data to the file when writing.

create a new file if none exists.

used with O_CREATE, file must not exist.

open the file read-only.

open the file read-write.

open for synchronous I/O.

truncate regular writable file when opened.

open the file write-only.