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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 24] 24.2 Save Space with Bit Bucket Log Files and Mailboxes</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="1998-08-04T21:41:27Z"><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="ch24_01.htm"TITLE="24. Other Ways to Get Disk Space"><LINKREL="prev"HREF="ch24_01.htm"TITLE="24.1 Instead of Removing a File, Empty It "><LINKREL="next"HREF="ch24_03.htm"TITLE="24.3 Unlinking Open Files Isn't a Good Idea "></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="ch24_01.htm"TITLE="24.1 Instead of Removing a File, Empty It "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 24.1 Instead of Removing a File, Empty It "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 24<BR>Other Ways to Get Disk Space</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch24_03.htm"TITLE="24.3 Unlinking Open Files Isn't a Good Idea "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 24.3 Unlinking Open Files Isn't a Good Idea "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0015">24.2 Save Space with Bit Bucket Log Files and Mailboxes</A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-26215"></A><ACLASS="indexterm"NAME="AUTOID-26218"></A><ACLASS="indexterm"NAME="AUTOID-26220"></A><ACLASS="indexterm"NAME="AUTOID-26222"></A>Some UNIX programs - usually background or daemon programs - insist on writinga log file.You might not want the log file itself as much as you want the disk space thatthe log file takes.Here are a few tips:</P><ULCLASS="itemizedlist"><LICLASS="listitem"><PCLASS="para">Some programs will write to a log file only if the log file exists.If the program isn't running,try removing the log file.</P></LI><LICLASS="listitem"><PCLASS="para">If you remove a log file and the program recreates it, look for command-lineoptions or a configuration file setup that tells the program not to make thelog file.</P></LI><LICLASS="listitem"><PCLASS="para">If your system has<SPANCLASS="link">symbolic links (<ACLASS="linkend"HREF="ch18_04.htm"TITLE="More About Links ">18.4</A>)</SPAN>,try replacing the log file with a symbolic link 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>:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen"># <CODECLASS="userinput"><B>rm logfile</B></CODE># <CODECLASS="userinput"><B>ln -s /dev/null logfile</B></CODE></PRE></BLOCKQUOTE></P><PCLASS="para">If you're lucky, the program won't complain and will throw all its messagesin the bit bucket.Watch out for programs that run at reboot or from the system<SPANCLASS="link"><EMCLASS="emphasis">crontab</EM> (<ACLASS="linkend"HREF="ch40_12.htm"TITLE="Periodic Program Execution: The cron Facility ">40.12</A>)</SPAN>to truncate and replace the log file.These programs might replace the symbolic link with a small regular filethat will start growing again.</P></LI><LICLASS="listitem"><PCLASS="para">Does a system mailbox for a user like <EMCLASS="emphasis">uucp</EM> keep getting<SPANCLASS="link">mail (<ACLASS="linkend"HREF="ch01_33.htm"TITLE="UNIX Networking and Communications ">1.33</A>)</SPAN>that you want to throw away?You may be able to add a<EMCLASS="emphasis">.forward</EM> file to the account's home directorywith this single line:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">/dev/null</PRE></BLOCKQUOTE></P><PCLASS="para">Or add an alias in the system mail alias file that does the same thing:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">uucp: /dev/null</PRE></BLOCKQUOTE></P><PCLASS="para">If your system has a command like <EMCLASS="emphasis">newaliases</EM> to rebuild the aliasdatabase, don't forget to use it after you make the change.</P></LI></UL><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="ch24_01.htm"TITLE="24.1 Instead of Removing a File, Empty It "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 24.1 Instead of Removing a File, Empty It "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="ch24_03.htm"TITLE="24.3 Unlinking Open Files Isn't a Good Idea "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 24.3 Unlinking Open Files Isn't a Good Idea "BORDER="0"></A></TD></TR><TR><TDALIGN="LEFT"VALIGN="TOP"WIDTH="172">24.1 Instead of Removing a File, Empty It </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">24.3 Unlinking Open Files Isn't a Good Idea </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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