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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 24] 24.5 Limiting File Sizes </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="1998-08-04T21:41:30Z"><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="ch24_01.htm"TITLE="24. Other Ways to Get Disk Space"><LINKREL="prev"HREF="ch24_04.htm"TITLE="24.4 Save Space with a Link "><LINKREL="next"HREF="ch24_06.htm"TITLE="24.6 Save Space with Tab Characters "></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_04.htm"TITLE="24.4 Save Space with a Link "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 24.4 Save Space with a Link "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_06.htm"TITLE="24.6 Save Space with Tab Characters "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 24.6 Save Space with Tab Characters "BORDER="0"></A></TD></TR></TABLE> <HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0072">24.5 Limiting File Sizes </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-26330"></A><ACLASS="indexterm"NAME="AUTOID-26332"></A><ACLASS="indexterm"NAME="AUTOID-26334"></A><ACLASS="indexterm"NAME="AUTOID-26336"></A>Here is a technique to keep you from creating large files (which canhappen by accident, such as runaway programs).To set a maximum file size, use the C shell command (usually in your<EMCLASS="emphasis">.cshrc</EM> file) <CODECLASS="literal">limit filesize </CODE><CODECLASS="replaceable"><I>max-size</I></CODE>.<ACLASS="indexterm"NAME="AUTOID-26341"></A>In the Korn shell and <EMCLASS="emphasis">bash</EM>, use <CODECLASS="literal">ulimit -f </CODE><CODECLASS="replaceable"><I>max-size</I></CODE>.You can change the limit from the command line, too.For example, the <EMCLASS="emphasis">csh</EM> and <EMCLASS="emphasis">ksh</EM> commands below keep you fromcreating any files larger than 2 megabytes:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>limit filesize 2m</B></CODE>$ <CODECLASS="userinput"><B>ulimit -f 2000</B></CODE></PRE></BLOCKQUOTE></P><PCLASS="para">With this command, UNIX will refuse to allocate more disk space to anyfile that grows larger than 2 MB.</P><PCLASS="para">Similarly, on Berkeley systems, you can use <EMCLASS="emphasis">limit</EM> and <EMCLASS="emphasis">ulimit</EM>to restrict the size of<SPANCLASS="link">core dump files (<ACLASS="linkend"HREF="glossary.htm#UPT-ART-1010"TITLE="Glossary">52.9</A>)</SPAN>.Core dumps are generally large files and are often generated for innocuous reasons, such as invoking commandsincorrectly.To set a maximum size for core dumps, execute one of these commands:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>limit coredumpsize </B></CODE><CODECLASS="replaceable"><I>max-size</I></CODE>$ <CODECLASS="userinput"><B>ulimit -c </B></CODE><CODECLASS="replaceable"><I>max-size</I></CODE></PRE></BLOCKQUOTE></P><PCLASS="para">To eliminate core dumps entirely, use <CODECLASS="literal">0</CODE> (zero) for <CODECLASS="replaceable"><I>max-size</I></CODE>.Because core dumpsare essential for effective debugging, any users who are actively<ACLASS="indexterm"NAME="AUTOID-26366"></A>debugging programs should know the commands <CODECLASS="literal">unlimit coredumpsize</CODE>,which removes this restriction in <EMCLASS="emphasis">csh</EM>-and <CODECLASS="literal">ulimit -c unlimited</CODE>for <EMCLASS="emphasis">bash</EM> and <EMCLASS="emphasis">ksh</EM>.</P><DIVCLASS="sect1info"><PCLASS="SECT1INFO">- <SPANCLASS="authorinitials">ML</SPAN> <SPANCLASS="bibliomisc">from O'Reilly & Associates' <CITECLASS="citetitle">System Performance Tuning</CITE>, Chapter 5</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_04.htm"TITLE="24.4 Save Space with a Link "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 24.4 Save Space with a Link "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_06.htm"TITLE="24.6 Save Space with Tab Characters "><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT="Next: 24.6 Save Space with Tab Characters 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