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<H2><A NAME="SECTION00589000000000000000">Other tools for all filesystems</A></H2>
<P>
Some other tools are also useful for managing filesystems.
<tt>df</tt><A NAME="1724"> </A> shows the free disk space on one or more filesystems;
<tt>du</tt><A NAME="1726"> </A> shows how much disk space a directory and all its
files contain. These can be used to hunt down disk space
wasters.
<P>
<tt>sync</tt><A NAME="1728"> </A> forces all unwritten blocks in the buffer cache
(see section <A HREF="node65.html#secbuffercache">5.6</A>) to be written to disk.
It is seldom necessary to do this by hand; the daemon process
<tt>update</tt><A NAME="1730"> </A> does this automatically. It can be useful in
catastrophies, for example if <tt>update</tt><A NAME="1732"> </A> or its helper process
<tt>bdflush</tt><A NAME="1734"> </A> dies, or if you must turn off power <tt>now</tt><A NAME="1736"> </A> and
can't wait for <tt>update</tt><A NAME="1738"> </A> to run.
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<P><ADDRESS>
<I>Lars Wirzenius <BR>
Sat Nov 15 02:32:11 EET 1997</I>
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