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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 3] 3.5 Stop Accidental C Shell Logouts </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="1998-08-04T21:32:33Z"><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="ch03_01.htm"TITLE="3. Logging Out"><LINKREL="prev"HREF="ch03_04.htm"TITLE="3.4 Automatic File Cleanup "><LINKREL="next"HREF="ch03_06.htm"TITLE="3.6 Stop Accidental Bourne Shell Logouts "></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="ch03_04.htm"TITLE="3.4 Automatic File Cleanup "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 3.4 Automatic File Cleanup "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 3<BR>Logging Out</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch03_06.htm"TITLE="3.6 Stop Accidental Bourne Shell Logouts "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 3.6 Stop Accidental Bourne Shell Logouts "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-1200">3.5 Stop Accidental C Shell Logouts </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-4139"></A><ACLASS="indexterm"NAME="AUTOID-4141"></A><ACLASS="indexterm"NAME="AUTOID-4143"></A><ACLASS="indexterm"NAME="AUTOID-4145"></A>Do you occasionally type CTRL-dby mistake and find out that you'resuddenly logged off the system? If you do, you should know aboutthe <EMCLASS="emphasis">ignoreeof</EM> shell variable or option.CTRL-d is the end-of-filecharacter; when a shell sees it, it thinks that no more input iscoming, so it quits.If you're in your<SPANCLASS="link">login shell (<ACLASS="linkend"HREF="ch51_09.htm"TITLE='Making a "Login" Shell'>51.9</A>)</SPAN>,you're suddenlylogged out. If you're not in your login shell, you may still be introuble: a window may have disappeared, or your environment may havesuddenly changed because you dropped from a<SPANCLASS="link">subshell (<ACLASS="linkend"HREF="ch38_04.htm"TITLE="Subshells ">38.4</A>)</SPAN>into the parent shell.</P><PCLASS="para">If you're a C shell user, you can solve this problem by setting the<EMCLASS="emphasis">ignoreeof</EM> shell variable:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">set ignoreeof # prevent accidental shell termination</PRE></BLOCKQUOTE></P><PCLASS="para">(Most users set this in their <EMCLASS="emphasis">.cshrc</EM> or <EMCLASS="emphasis">.login</EM> files.)Now typing CTRL-dwon't terminate the shell. Instead, you'll get apolite message: <CODECLASS="literal">Use</CODE> <CODECLASS="literal">`logout'</CODE> <CODECLASS="literal">to</CODE> <CODECLASS="literal">logout</CODE> orperhaps <CODECLASS="literal">Use</CODE> <CODECLASS="literal">`exit'</CODE> <CODECLASS="literal">to</CODE> <CODECLASS="literal">leave</CODE> <CODECLASS="literal">csh</CODE>.</P><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-4168"></A><ACLASS="indexterm"NAME="AUTOID-4171"></A>In the Korn shell and <EMCLASS="emphasis">bash</EM>,use <CODECLASS="literal">set</CODE> <CODECLASS="literal">-o</CODE> <CODECLASS="literal">ignoreeof</CODE> instead.If you use the Bourne shell, article<ACLASS="xref"HREF="ch03_06.htm"TITLE="Stop Accidental Bourne Shell Logouts ">3.6</A>has a workaround for the problem.</P><PCLASS="para">If you're like me, you won't use this feature; I happen to find CTRL-da convenient shorthand for the <EMCLASS="emphasis">logout</EM> or <EMCLASS="emphasis">exit</EM> commands.But my taste is certainly disputable, and even I will admit that myfingers sometimes err.</P><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">ML</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="ch03_04.htm"TITLE="3.4 Automatic File Cleanup "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 3.4 Automatic File Cleanup "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="ch03_06.htm"TITLE="3.6 Stop Accidental Bourne Shell Logouts "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 3.6 Stop Accidental Bourne Shell Logouts "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">3.4 Automatic File Cleanup </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">3.6 Stop Accidental Bourne Shell Logouts </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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