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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 19] 19.8 Problems with Verbose tar </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="1998-08-04T21:39:30Z"><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="ch19_01.htm"TITLE="19. Creating and Reading Archives"><LINKREL="prev"HREF="ch19_07.htm"TITLE="19.7 Extracting Files from a Compressed Archive "><LINKREL="next"HREF="ch19_09.htm"TITLE="19.9 A System V Tape Archiver: cpio "></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="ch19_07.htm"TITLE="19.7 Extracting Files from a Compressed Archive "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 19.7 Extracting Files from a Compressed Archive "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 19<BR>Creating and Reading Archives</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch19_09.htm"TITLE="19.9 A System V Tape Archiver: cpio "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 19.9 A System V Tape Archiver: cpio "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-6900">19.8 Problems with Verbose tar </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-21576"></A>I've heard of one <EMCLASS="emphasis">tar</EM> version with a <EMCLASS="emphasis">v</EM> (verbose) option thatwrites the verbose information to its standard output, rather thanstandard error.If your <EMCLASS="emphasis">tar</EM> does that, be sure not to use <EMCLASS="emphasis">v</EM> when you'reusing <EMCLASS="emphasis">tar</EM> to write to a pipeline. For example, the commandthat follows would be a disaster if your version of <EMCLASS="emphasis">tar</EM> has this bug:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>tar cvf - *.txt | gzip > archive.tar.gz</B></CODE></PRE></BLOCKQUOTE></P><PCLASS="para">The filenames would appear in standard output, along with the<EMCLASS="emphasis">tar</EM> archive itself. The result would be a <EMCLASS="emphasis">gzip</EM>ped archive thatcouldn't be extracted. (You'd probably get a "checksum error"from <EMCLASS="emphasis">tar</EM>, or something similar, if you tried.)</P><PCLASS="para">You can test for this problem by typing:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>tar cvf -</B></CODE> <CODECLASS="replaceable"><I>somefile</I></CODE> <CODECLASS="userinput"><B>> /dev/null</B></CODE> <EMCLASS="emphasis">tar without</EM> <CODECLASS="literal">v</CODE> <EMCLASS="emphasis">bug</EM>a <CODECLASS="replaceable"><I>somefile</I></CODE> 23 blocks, 44567 characters</PRE></BLOCKQUOTE></P><PCLASS="para">That redirects standard output to<SPANCLASS="link"><EMCLASS="emphasis">/dev/null</EM> (<ACLASS="linkend"HREF="ch13_14.htm"TITLE="What Can You Do with an Empty File? ">13.14</A>)</SPAN>.If you don't see any verbose output, your <EMCLASS="emphasis">tar</EM> has the bug.</P><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">JP</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="ch19_07.htm"TITLE="19.7 Extracting Files from a Compressed Archive "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 19.7 Extracting Files from a Compressed Archive "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="ch19_09.htm"TITLE="19.9 A System V Tape Archiver: cpio "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 19.9 A System V Tape Archiver: cpio "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">19.7 Extracting Files from a Compressed Archive </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">19.9 A System V Tape Archiver: cpio </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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