OSIXLY_CORRECT is defined.

     -m, --magic-file list
             Specify an alternate list of files and directories containing
             magic.  This can be a single item, or a colon-separated list.  If
             a compiled magic file is found alongside a file or directory, it
             will be used instead.

     -n, --no-buffer
             Force stdout to be flushed after checking each file.  This is
             only useful if checking a list of files.  It is intended to be
             used