@c This file is designed to be included in manuals that use @c expandargv. @item @@@var{file} Read command-line options from @var{file}. The options read are inserted in place of the original @@@var{file} option. If @var{file} does not exist, or cannot be read, then the option will be treated literally, and not removed. Options in @var{file} are separated by whitespace. A whitespace character may be included in an option by surrounding the entire option in either single or double quotes. Any character (including a backslash) may be included by prefixing the character to be included with a backslash. The @var{file} may itself contain additional @@@var{file} options; any such options will be processed recursively.