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<HTML><!--Distributed by F --><HEAD><TITLE>[Preface] What's New in the Second Edition </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="1998-10-23T15:23:40Z"><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_07.htm"TITLE="Cross-References "><LINKREL="next"HREF="prf1_09.htm"TITLE="Typefaces and Other Conventions "></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_07.htm"TITLE="Cross-References "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: Cross-References "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_09.htm"TITLE="Typefaces and Other Conventions "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: Typefaces and Other Conventions "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-CHP-0-8">What's New in the Second Edition </A></H2><PCLASS="para">There've been some big changes in UNIX since we wrote the firstedition in the early 1990s.We've made this second edition ready for the late 1990s-and, if we guessedright, for the start of the next century.Almost 550 of the more than 800 original articles were revised:many got small edits, but quite a few were completely rewritten.We included literally hundreds of reader suggestions and corrections.The CD-ROM has updated scripts and files, as well as binaries fortoday's UNIX platforms (including Linux).The biggest changes were:</P><ULCLASS="itemizedlist"><LICLASS="listitem"><PCLASS="para">The original split between the System V and BSD flavors ofUNIX is still apparent, but it's less important.We've slanted the blend of options and commands more toward the POSIXutilities, including the GNU versions (which are close to POSIXnow, but with other features too).</P></LI><LICLASS="listitem"><PCLASS="para">The shells <EMCLASS="emphasis">tcsh</EM> and <EMCLASS="emphasis">bash</EM> are much more common now than thefootnotes we gave them before.Because <EMCLASS="emphasis">bash</EM> seems to have combined the superior Bourne shellprogrammability with handy <EMCLASS="emphasis">csh</EM> interactive features (and more!),we've given it more new coverage than <EMCLASS="emphasis">tcsh</EM>.But there's plenty for <EMCLASS="emphasis">tcsh</EM> users here:the first edition was very strong in <EMCLASS="emphasis">csh</EM>, and almosteverything you'll read about <EMCLASS="emphasis">csh</EM> applies directly to <EMCLASS="emphasis">tcsh</EM>.Overall, we've kept the first edition's emphasis on the core concepts of<EMCLASS="emphasis">sh</EM> and <EMCLASS="emphasis">csh</EM> that will help you use all UNIX shells.</P></LI><LICLASS="listitem"><PCLASS="para">The separate chapter on <EMCLASS="emphasis">awk</EM> is gone; Perl is much more importantthan <EMCLASS="emphasis">awk</EM> these days.Some of the original articles, including the handy nine-page<SPANCLASS="link"><EMCLASS="emphasis">awk</EM> reference (<ACLASS="linkend"HREF="ch33_11.htm"TITLE="Quick Reference: awk ">33.11</A>)</SPAN>,have been merged into other chapters.The short chapter on passwords and security is also history now.Just as the book we adapted it from (<EMCLASS="emphasis">Practical UNIX and InternetSecurity</EM>) has almost doubled in size, the topic is too important thesedays for the short coverage we gave it before.As we did with Perl in both editions, we've left much of the securityinformation for other books to cover in depth.(We've still got plenty of cool tips on filesystems and accesspermissions, though.)</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_07.htm"TITLE="Cross-References "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: Cross-References "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_09.htm"TITLE="Typefaces and Other Conventions "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: Typefaces and Other Conventions "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">Cross-References </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">Typefaces and Other Conventions </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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