--total (-c), not with --summarize.
@cindex including files from @command{du}
Rather than processing files named on the command line, process those
in the NUL-separated list in file @var{FILE0}.
-This is useful with the @option{--summarize} (@option{-s}) option when
+This is useful with the @option{--total} (@option{-c}) option when
the list of file names is so long that it may exceed a command line
length limitation.
In such cases, running @command{du} via @command{xargs} is undesirable