o</code> just keeps its default value as specified in
the application.</p>

<p>Note it is still an error to say <code>--tryfromenv=foo</code> if
<code>foo</code> is not DEFINED somewhere in the application.</p>

<h3> <code>--flagfile</code> </h3>

<p><code>--flagfile=f</code> tells the commandlineflags module to read
the file <code>f</code>, and to run all the flag-assignments found in
that file as if these flags had been specified on the commandline.</p>

<p>In its simplest form, <code>f</code> should just