📄 at-file.texi
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@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 areinserted in place of the original @@@var{file} option. If @var{file}does not exist, or cannot be read, then the option will be treatedliterally, and not removed. Options in @var{file} are separated by whitespace. A whitespacecharacter may be included in an option by surrounding the entireoption in either single or double quotes. Any character (including abackslash) may be included by prefixing the character to be includedwith a backslash. The @var{file} may itself contain additional@@@var{file} options; any such options will be processed recursively.
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