at position, it will jump to the true beginning of the
line.
</p>
</dd>
<dt><samp>-B</samp></dt>
<dt><samp>--backup</samp></dt>
<dd><p>When saving a file, back up the previous version of it, using the current
filename suffixed with a tilde (<code>~</code>).
</p>
</dd>
<dt><samp>-C <var>directory</var></samp></dt>
<dt><samp>--backupdir=<var>directory</var></samp></dt>
<dd><p>Make and keep not just one backup file, but make and keep a uniquely
numbered one every time a file is saved &mdash; when backups are e