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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 20] 20.5 Using tar to a Remote Tape Drive </TITLE><METANAME="DC.title"CONTENT="UNIX Power Tools"><METANAME="DC.creator"CONTENT="Jerry Peek, Tim O'Reilly & Mike Loukides"><METANAME="DC.publisher"CONTENT="O'Reilly & Associates, Inc."><METANAME="DC.date"CONTENT="1998-10-23T15:44:54Z"><METANAME="DC.type"CONTENT="Text.Monograph"><METANAME="DC.format"CONTENT="text/html"SCHEME="MIME"><METANAME="DC.source"CONTENT="1-56592-260-3"SCHEME="ISBN"><METANAME="DC.language"CONTENT="en-US"><METANAME="generator"CONTENT="Jade 1.1/O'Reilly DocBook 3.0 to HTML 4.0"><LINKREV="made"HREF="mailto:online-books@oreilly.com"TITLE="Online Books Comments"><LINKREL="up"HREF="ch20_01.htm"TITLE="20. Backing Up Files"><LINKREL="prev"HREF="ch20_04.htm"TITLE="20.4 Restoring Files from Tape with tar "><LINKREL="next"HREF="ch20_06.htm"TITLE="20.6 Writing a Tape Drive on a Remote Machine "></HEAD><BODYBGCOLOR="#FFFFFF"TEXT="#000000"><DIVCLASS="htmlnav"><H1><IMGSRC="gifs/smbanner.gif"ALT="UNIX Power Tools"USEMAP="#srchmap"BORDER="0"></H1><MAPNAME="srchmap"><AREASHAPE="RECT"COORDS="0,0,466,58"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="467,0,514,18"HREF="jobjects/fsearch.htm"ALT="Search this book"></MAP><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch20_04.htm"TITLE="20.4 Restoring Files from Tape with tar "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 20.4 Restoring Files from Tape with tar "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 20<BR>Backing Up Files</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch20_06.htm"TITLE="20.6 Writing a Tape Drive on a Remote Machine "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 20.6 Writing a Tape Drive on a Remote Machine "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0423">20.5 Using tar to a Remote Tape Drive </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-22066"></A><ACLASS="indexterm"NAME="AUTOID-22069"></A><ACLASS="indexterm"NAME="AUTOID-22071"></A><ACLASS="indexterm"NAME="AUTOID-22074"></A>If your computer doesn't havea tape drive connected,creating<SPANCLASS="link"><EMCLASS="emphasis">tar</EM> (<ACLASS="linkend"HREF="ch20_01.htm#UPT-ART-8024"TITLE="tar in a Nutshell ">20.1</A>)</SPAN>backup files is slightly more complicated.If you have an account on a machine with a tape drive,and the directory ismounted via<SPANCLASS="link">NFS (<ACLASS="linkend"HREF="ch01_33.htm"TITLE="UNIX Networking and Communications ">1.33</A>)</SPAN>,you can just <SPANCLASS="link"><EMCLASS="emphasis">rlogin</EM> (<ACLASS="linkend"HREF="ch01_33.htm"TITLE="UNIX Networking and Communications ">1.33</A>)</SPAN>to the other machine and use <EMCLASS="emphasis">tar</EM>to back up your directory.</P><PCLASS="para">If the directory is not NFS mounted, or it is mounted but you have permission problems accessing your own files,you can use <EMCLASS="emphasis">tar</EM>,<SPANCLASS="link"><EMCLASS="emphasis">rsh</EM> (<ACLASS="linkend"HREF="ch01_33.htm"TITLE="UNIX Networking and Communications ">1.33</A>)</SPAN>,and<SPANCLASS="link"><EMCLASS="emphasis">dd</EM> (<ACLASS="linkend"HREF="ch35_06.htm"TITLE="Low-Level File Butchery with dd ">35.6</A>)</SPAN>to solve this dilemma.The syntax is confusing, but if you forget, you can use<SPANCLASS="link"><EMCLASS="emphasis">man tar</EM> (<ACLASS="linkend"HREF="ch50_01.htm#UPT-ART-4910"TITLE="UNIX Online Documentation ">50.1</A>)</SPAN>to refresh your memory.The command to dump the current directory toa tape in a remote machine called <EMCLASS="emphasis">zephyrus</EM> is:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>tar cvfb - 20 . | rsh zephyrus dd of=/dev/rmt0 obs=20b</B></CODE></PRE></BLOCKQUOTE></P><PCLASS="para">Here, the output file of<EMCLASS="emphasis">tar</EM>is<SPANCLASS="link"><CODECLASS="literal">-</CODE> (<ACLASS="linkend"HREF="ch13_13.htm"TITLE='The "Filename" - '>13.13</A>)</SPAN>,which <EMCLASS="emphasis">tar</EM>interprets as standard input if <EMCLASS="emphasis">tar</EM>is reading an archive or standard outputif <EMCLASS="emphasis">tar</EM>is creating an archive.</P><PCLASS="para">The<EMCLASS="emphasis">dd</EM>command copies data from standard input to the device<EMCLASS="emphasis">/dev/rmt0</EM>.Article<ACLASS="xref"HREF="ch20_06.htm"TITLE="Writing a Tape Drive on a Remote Machine ">20.6</A>explains more about how this works.</P><PCLASS="para">This example assumes you can use<EMCLASS="emphasis">rsh</EM>without requiring a password.<ACLASS="indexterm"NAME="AUTOID-22108"></A>You can add your current machine's name to the remote<SPANCLASS="link"><EMCLASS="emphasis">.rhosts</EM> file (<ACLASS="linkend"HREF="ch01_33.htm"TITLE="UNIX Networking and Communications ">1.33</A>)</SPAN>if you get a <CODECLASS="literal">Password:</CODE> promptwhen you use<EMCLASS="emphasis">rlogin</EM>to access this machine.</P><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">BB</SPAN></P></DIV></DIV><DIVCLASS="htmlnav"><P></P><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><TABLEWIDTH="515"BORDER="0"CELLSPACING="0"CELLPADDING="0"><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch20_04.htm"TITLE="20.4 Restoring Files from Tape with tar "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 20.4 Restoring Files from Tape with tar "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="book"HREF="index.htm"TITLE="UNIX Power Tools"><IMGSRC="gifs/txthome.gif"SRC="gifs/txthome.gif"ALT="UNIX Power Tools"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch20_06.htm"TITLE="20.6 Writing a Tape Drive on a Remote Machine "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 20.6 Writing a Tape Drive on a Remote Machine "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">20.4 Restoring Files from Tape with tar </TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><ACLASS="index"HREF="index/idx_0.htm"TITLE="Book Index"><IMGSRC="gifs/index.gif"SRC="gifs/index.gif"ALT="Book Index"BORDER="0"></A></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172">20.6 Writing a Tape Drive on a Remote Machine </TD></TR></TABLE><HRALIGN="LEFT"WIDTH="515"TITLE="footer"><IMGSRC="gifs/smnavbar.gif"SRC="gifs/smnavbar.gif"USEMAP="#map"BORDER="0"ALT="The UNIX CD Bookshelf Navigation"><MAPNAME="map"><AREASHAPE="RECT"COORDS="0,0,73,21"HREF="../index.htm"ALT="The UNIX CD Bookshelf"><AREASHAPE="RECT"COORDS="74,0,163,21"HREF="index.htm"ALT="UNIX Power Tools"><AREASHAPE="RECT"COORDS="164,0,257,21"HREF="../unixnut/index.htm"ALT="UNIX in a Nutshell"><AREASHAPE="RECT"COORDS="258,0,321,21"HREF="../vi/index.htm"ALT="Learning the vi Editor"><AREASHAPE="RECT"COORDS="322,0,378,21"HREF="../sedawk/index.htm"ALT="sed & awk"><AREASHAPE="RECT"COORDS="379,0,438,21"HREF="../ksh/index.htm"ALT="Learning the Korn Shell"><AREASHAPE="RECT"COORDS="439,0,514,21"HREF="../lrnunix/index.htm"ALT="Learning the UNIX Operating System"></MAP></DIV></BODY></HTML>⌨️ 快捷键说明
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