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<HTML><!--Distributed by F --><HEAD><TITLE>[Preface] About UNIX Versions </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="1998-10-23T15:23:39Z"><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="prf1_01.htm"TITLE="Preface"><LINKREL="prev"HREF="prf1_05.htm"TITLE="Programs on the CD-ROM "><LINKREL="next"HREF="prf1_07.htm"TITLE="Cross-References "></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="prf1_05.htm"TITLE="Programs on the CD-ROM "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: Programs on the CD-ROM "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Preface</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="prf1_07.htm"TITLE="Cross-References "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: Cross-References "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-CHP-0-6">About UNIX Versions </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-58"></A><ACLASS="indexterm"NAME="AUTOID-61"></A>There are lots of similarities between different versions of UNIX.But it's almost impossible to write a book that covers every detail ofevery version correctly.Where we know there might be big differences or problems, we'llprint a note in the text.Other places, we're forced to use "weasel words" like "Some versions ofxxxxxx will do..." without telling you exactly <EMCLASS="emphasis">which</EM> versions.When you see those weasel words, what can you do?</P><ULCLASS="itemizedlist"><LICLASS="listitem"><PCLASS="para">If the command or feature won't destroy anything when it doesn't work,try it!For instance, don't experiment with <EMCLASS="emphasis">rm</EM>, the command that removesfiles.But <EMCLASS="emphasis">cat</EM>, a command that shows files, most likely won't hurt anythingif some feature we tell you about doesn't work with your version.</P></LI><LICLASS="listitem"><PCLASS="para">Look at the<SPANCLASS="link"><EMCLASS="emphasis">online</EM> manual (<ACLASS="linkend"HREF="ch50_01.htm#UPT-ART-4910"TITLE="UNIX Online Documentation ">50.1</A>)</SPAN>or check your <EMCLASS="emphasis">vendor's</EM> latestprinted manuals.Even these can be wrong.For instance, your system administrator mayhave installed a local version of a command that works differently-butnot updated the online documentation.(The<SPANCLASS="link"><EMCLASS="emphasis">which</EM> (<ACLASS="linkend"HREF="ch50_08.htm"TITLE="Which Version Am I Using? ">50.8</A>)</SPAN>and<SPANCLASS="link"><EMCLASS="emphasis">whereiz</EM> (<ACLASS="linkend"HREF="ch04_10.htm"TITLE="Find All Command Versions with whereiz ">4.10</A>)</SPAN>commands, along with some knowledge aboutthe organization of your filesystemcan help you find this out yourself.)Be careful with "generic" manuals, the kind you buy at a bookstore;there are a lot of versions of UNIX and the manual may not match yourversion closely enough.</P></LI><LICLASS="listitem"><PCLASS="para">Ask your system administrator or another "guru" for help before you usea command that might be dangerous.</P></LI></UL></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="prf1_05.htm"TITLE="Programs on the CD-ROM "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: Programs on the CD-ROM "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="prf1_07.htm"TITLE="Cross-References "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: Cross-References "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">Programs on the CD-ROM </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">Cross-References </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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