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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
<!Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
<HEAD>
<TITLE>4.5.2 gzip and compress</TITLE>
</HEAD>
<BODY>
<meta name="description" value="4.5.2 gzip and compress">
<meta name="keywords" value="gs">
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<P>
<BR> <HR><A NAME=tex2html3986 HREF="node175.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html3984 HREF="node172.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html3978 HREF="node173.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html3988 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html3989 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
<B> Next:</B> <A NAME=tex2html3987 HREF="node175.html">4.5.3 Putting them together</A>
<B>Up:</B> <A NAME=tex2html3985 HREF="node172.html">4.5 Archiving and Compressing </A>
<B> Previous:</B> <A NAME=tex2html3979 HREF="node173.html">4.5.1 Using tar</A>
<BR> <HR> <P>
<H2><A NAME=SECTION00652000000000000000>4.5.2 gzip and compress</A></H2>
<P>
<A NAME=4667>&#160;</A>
<A NAME=4668>&#160;</A>
Unlike archiving programs for MS-DOS, <tt>tar</tt> does not automatically
compress files as it archives them. Therefore, if you are archiving
two 1-megabyte files, the resulting tar file will be two megabytes in
size. The <tt>gzip</tt> command may be used to compress a file (the file
to compress need not be a tar file). The command
<P><TT> # <em>gzip -9 backup.tar</em>
<P></TT>
will compress <tt>backup.tar</tt> and leave you with <tt>backup.tar.gz</tt>,
the compressed version of the file. The <tt>-9</tt> switch tells
<tt>gzip</tt> to use the highest compression factor.
<P>
The <tt>gunzip</tt> command may be used to uncompress a gzipped file.
Equivalently, you may use ``<tt>gzip -d</tt>''.
<P>
<tt>gzip</tt> is a relatively new tool in the UNIX community. For many
years, the <tt>compress</tt> command was used instead. However, because
of several factors<A NAME=tex2html808 HREF="footnode.html#4669"><IMG ALIGN=BOTTOM ALT="gif" SRC="foot_motif.gif"></A>, <tt>compress</tt>
is being phased out.
<P>
<tt>compress</tt>ed files end in the extension <tt>.Z</tt>. For example,
<tt>backup.tar.Z</tt> is the compressed version of <tt>backup.tar</tt>, while
<tt>backup.tar.gz</tt> is the gzipped version<A NAME=tex2html809 HREF="footnode.html#4670"><IMG ALIGN=BOTTOM ALT="gif" SRC="foot_motif.gif"></A>. The <tt>uncompress</tt> command is used to expand a
<tt>compress</tt>ed file; <tt>gunzip</tt> knows how to handle <tt>compress</tt>ed
files as well.
<P>
<BR> <HR><A NAME=tex2html3986 HREF="node175.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html3984 HREF="node172.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html3978 HREF="node173.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html3988 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html3989 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
<B> Next:</B> <A NAME=tex2html3987 HREF="node175.html">4.5.3 Putting them together</A>
<B>Up:</B> <A NAME=tex2html3985 HREF="node172.html">4.5 Archiving and Compressing </A>
<B> Previous:</B> <A NAME=tex2html3979 HREF="node173.html">4.5.1 Using tar</A>
<BR> <HR> <P>
<BR> <HR>
<P><ADDRESS>
<I>Matt Welsh <BR>
mdw@sunsite.unc.edu</I>
</ADDRESS>
</BODY>