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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><!--Converted with LaTeX2HTML 96.1-h (September 30, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><HTML><HEAD><TITLE>Restoring files with tar</TITLE><META NAME="description" CONTENT="Restoring files with tar"><META NAME="keywords" CONTENT="sag"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><LINK REL=STYLESHEET HREF="sag.css"></HEAD><BODY LANG="EN" > <A NAME="tex2html1506" HREF="node97.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="./next_motif.gif"></A> <A NAME="tex2html1504" HREF="node94.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="./up_motif.gif"></A> <A NAME="tex2html1500" HREF="node95.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="./previous_motif.gif"></A> <A NAME="tex2html1508" HREF="node1.html"><IMG WIDTH=65 HEIGHT=24 ALIGN=BOTTOM ALT="contents" SRC="./contents_motif.gif"></A> <A NAME="tex2html1509" HREF="node108.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="./index_motif.gif"></A> <BR><B> Next:</B> <A NAME="tex2html1507" HREF="node97.html">Multilevel backups</A><B>Up:</B> <A NAME="tex2html1505" HREF="node94.html">Simple backups</A><B> Previous:</B> <A NAME="tex2html1501" HREF="node95.html">Making backups with tar</A><BR> <P><A NAME="2717"> </A><H2><A NAME="SECTION001042000000000000000">用<tt>tar</tt></A>回存</H2><P><tt>tar</tt><A NAME="2719"> </A>的<tt>-extract</tt> (<tt>-x</tt>)选项展开文件： <BLOCKQUOTE> <TT># tar -extract -same-permissions -verbose -file /dev/fd0H1440 <BR> usr/src/ <BR> usr/src/linux <BR> usr/src/linux-1.2.10-includes/ <BR> usr/src/linux-1.2.10-includes/include/ <BR> usr/src/linux-1.2.10-includes/include/linux/ <BR> usr/src/linux-1.2.10-includes/include/linux/hdreg.h <BR> usr/src/linux-1.2.10-includes/include/linux/kernel.h <BR> ... <BR> # </TT></BLOCKQUOTE>也可以用命令行只展开特定的文件和目录(及其中的文件和子目录)： <BLOCKQUOTE> <TT># tar xpvf /dev/fd0H1440 usr/src/linux-1.2.10-includes/include/linux/hdreg.h <BR> usr/src/linux-1.2.10-includes/include/linux/hdreg.h <BR> # </TT></BLOCKQUOTE>用<tt>-list</tt> (<tt>-t</tt>)选项看一个备份卷中有什么文件： <BLOCKQUOTE> <TT># tar -list -file /dev/fd0H1440 <BR> usr/src/ <BR> usr/src/linux <BR> usr/src/linux-1.2.10-includes/ <BR> usr/src/linux-1.2.10-includes/include/ <BR> usr/src/linux-1.2.10-includes/include/linux/ <BR> usr/src/linux-1.2.10-includes/include/linux/hdreg.h <BR> usr/src/linux-1.2.10-includes/include/linux/kernel.h <BR> ... <BR> # </TT></BLOCKQUOTE>注意<tt>tar</tt><A NAME="2721"> </A>永远是顺序读一个备份卷，因此大的卷会很慢。使用磁带机或其他顺序介质时不可能使用随机存取数据库技术。<P><tt>tar</tt><A NAME="2723"> </A>不处理删除文件属性。如果你需要从一个全备份和一个增量备份恢复一个文件系统，并且2个备份之间你删除了一个文件，当你恢复完后，这个文件又存在了。如果这个文件包含应该删除的敏感数据，这是个大问题。<P><BR> <HR><P><ADDRESS><I>Lars Wirzenius <BR>Sun Jun 29 13:31:22 EEST 1997</I></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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