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<HTML><HEAD><TITLE>Installing Ed-0.2</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.63"><LINKREL="HOME"TITLE="Linux From Scratch"HREF="../index.html"><LINKREL="UP"TITLE="Installing basic system software"HREF="../chapter06/chapter06.html"><LINKREL="PREVIOUS"TITLE="Installing Bzip2-1.0.1"HREF="../chapter06/bzip2.html"><LINKREL="NEXT"TITLE="Installing Gettext-0.10.40"HREF="../chapter06/gettext.html"></HEAD><BODYCLASS="sect1"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><THCOLSPAN="3"ALIGN="center">Linux From Scratch: Version 3.1</TH></TR><TR><TDWIDTH="10%"ALIGN="left"VALIGN="bottom"><AHREF="../chapter06/bzip2.html">Prev</A></TD><TDWIDTH="80%"ALIGN="center"VALIGN="bottom">Chapter 6. Installing basic system software</TD><TDWIDTH="10%"ALIGN="right"VALIGN="bottom"><AHREF="../chapter06/gettext.html">Next</A></TD></TR></TABLE><HRALIGN="LEFT"WIDTH="100%"></DIV><DIVCLASS="sect1"><H1CLASS="sect1"><ANAME="ch06-ed">6.29. Installing Ed-0.2</A></H1><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><FONTCOLOR="#000000"><PRECLASS="screen">Estimated build time: 1 minuteEstimated required disk space: 2 MB</PRE></FONT></TD></TR></TABLE><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN2651">6.29.1. Installation of Ed</A></H2><P>Ed is an optional package. The only program on a normal LFS systemthat uses ed is patch. But these days, ed patch files are quite rare infavour of the diff format patch files. So, if you personally have noneed to use ed, you can skip it.</P><P>Install Ed by running the following commands:</P><P><TABLEBORDER="0"BGCOLOR="#E0E0E0"WIDTH="100%"><TR><TD><FONTCOLOR="#000000"><PRECLASS="screen"><TTCLASS="userinput"><B>cp buf.c buf.c.backup &&sed 's/int u/int u, sfd/' buf.c.backup | \牋爏ed '/.*\*mktemp.*/d' | \牋爏ed 's/.*if (mktemp.*/ sfd = mkstemp(sfn);\牋爄f ((sfd == -1) || (sfp = fopen (sfn, "w+")) == NULL)/' > buf.c &&./configure --prefix=/usr &&make &&make install &&mv /usr/bin/ed /usr/bin/red /bin</B></TT></PRE></FONT></TD></TR></TABLE></P></DIV><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN2658">6.29.2. Command explanations</A></H2><P>The sed commands fix a symlink vulnerability in ed. The edexecutable creates files in /tmp with predictable names. By usingvarious symlink attacks, it is possible to have ed write to files it should not, change the permissions of various files, etc.</P></DIV><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN2661">6.29.3. Contents</A></H2><P>The Ed package contains the ed program.</P></DIV><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN2664">6.29.4. Description</A></H2><P>Ed is a line-oriented text editor. It is used to create, display,modify andotherwise manipulate text files.</P></DIV><DIVCLASS="sect2"><H2CLASS="sect2"><ANAME="AEN2667">6.29.5. Dependencies</A></H2><P>Ed-0.2 needs the following to be installed:</P><PCLASS="literallayout"><br>sh from the bash package<br><br>ar from the binutils package<br>as from the binutils package<br>ld from the binutils package<br><br>chmod from the fileutils package<br>cp from the fileutils package<br>ln from the fileutils package<br>mv from the fileutils package<br>rm from the fileutils package<br>touch from the fileutils package<br><br>cc from the gcc package<br><br>grep from the grep package<br>egrep from the grep package<br><br>make from the make package<br><br>sed from the sed package<br><br>cat from the textutils package<br>tr from the textutils package<br></P></DIV></DIV><DIVCLASS="NAVFOOTER"><HRALIGN="LEFT"WIDTH="100%"><TABLEWIDTH="100%"BORDER="0"CELLPADDING="0"CELLSPACING="0"><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top"><AHREF="../chapter06/bzip2.html">Prev</A></TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="../index.html">Home</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top"><AHREF="../chapter06/gettext.html">Next</A></TD></TR><TR><TDWIDTH="33%"ALIGN="left"VALIGN="top">Installing Bzip2-1.0.1</TD><TDWIDTH="34%"ALIGN="center"VALIGN="top"><AHREF="../chapter06/chapter06.html">Up</A></TD><TDWIDTH="33%"ALIGN="right"VALIGN="top">Installing Gettext-0.10.40</TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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