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<HTML><!--Distributed by F --><HEAD><TITLE>[Chapter 13] 13.12 Writing to Multiple Terminals for Demonstrations </TITLE><METANAME="DC.title"CONTENT="UNIX Power Tools"><METANAME="DC.creator"CONTENT="Jerry Peek, Tim O'Reilly &amp; Mike Loukides"><METANAME="DC.publisher"CONTENT="O'Reilly &amp; Associates, Inc."><METANAME="DC.date"CONTENT="1998-08-04T21:36:50Z"><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="ch13_01.htm"TITLE="13. Redirecting Input and Output"><LINKREL="prev"HREF="ch13_11.htm"TITLE="13.11 tpipe-Redirecting stdout to More than One Place "><LINKREL="next"HREF="ch13_13.htm"TITLE='13.13 The "Filename&quot; - '></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="ch13_11.htm"TITLE="13.11 tpipe-Redirecting stdout to More than One Place "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 13.11 tpipe-Redirecting stdout to More than One Place "BORDER="0"></A></TD><TDALIGN="CENTER"VALIGN="TOP"WIDTH="171"><B><FONTFACE="ARIEL,HELVETICA,HELV,SANSERIF"SIZE="-1">Chapter 13<BR>Redirecting Input and Output</FONT></B></TD><TDALIGN="RIGHT"VALIGN="TOP"WIDTH="172"><ACLASS="SECT1"HREF="ch13_13.htm"TITLE='13.13 The "Filename&quot; - '><IMGSRC="gifs/txtnexta.gif"SRC="gifs/txtnexta.gif"ALT='Next: 13.13 The "Filename&quot; - 'BORDER="0"></A></TD></TR></TABLE>&nbsp;<HRALIGN="LEFT"WIDTH="515"TITLE="footer"></DIV><DIVCLASS="SECT1"><H2CLASS="sect1"><ACLASS="title"NAME="UPT-ART-0115">13.12 Writing to Multiple Terminals for Demonstrations </A></H2><PCLASS="para"><ACLASS="indexterm"NAME="AUTOID-14723"></A><ACLASS="indexterm"NAME="AUTOID-14726"></A><ACLASS="indexterm"NAME="AUTOID-14729"></A>To show what one person is typing, and let people watch at other terminals:</P><OLCLASS="orderedlist"><LICLASS="listitem"><PCLASS="para">The person doing the demonstration starts an interactive shellwith a command like:</P><PCLASS="para"><BLOCKQUOTECLASS="screen"><PRECLASS="screen">% <CODECLASS="userinput"><B>csh -i |&amp; tee /tmp/log</B></CODE>$ <CODECLASS="userinput"><B>csh -i 2&gt;&amp;1 | tee /tmp/log</B></CODE></PRE></BLOCKQUOTE></P><PCLASS="para">Use <EMCLASS="emphasis">exit</EM> to leave the shell.To start a Bourne shell, type <EMCLASS="emphasis">sh</EM> instead of <EMCLASS="emphasis">csh</EM>.</P></LI><LICLASS="listitem"><PCLASS="para">Everyone who wants to watch types:</P><PCLASS="para"><TABLECLASS="screen.co"BORDER="1"><TR><THVALIGN="TOP"><PRECLASS="calloutlist"><ACLASS="co"HREF="ch25_16.htm"TITLE="25.16 How to Look at a File as It Grows ">tail -f</A> &#13;</PRE></TH><TDVALIGN="TOP"><PRECLASS="screen">&#13;tail -f <CODECLASS="userinput"><B>/tmp/log</B></CODE></PRE></TD></TR></TABLE></P><PCLASS="para">and uses CTRL-cto kill <EMCLASS="emphasis">tail-f</EM> when they're done.</P></LI></OL><PCLASS="para">&#13;There are a couple of gotchas:</P><ULCLASS="itemizedlist"><LICLASS="listitem"><PCLASS="para">The person who's doing the demonstration won't be able to use full-screen programs like <EMCLASS="emphasis">vi</EM> that expect theiroutputs to go to a terminal (instead of a pipe).</P></LI><LICLASS="listitem"><PCLASS="para">Commands may echo onto the screen but not into the log file.If that happens, type <CODECLASS="literal">csh</CODE>&nbsp;<CODECLASS="literal">-iv</CODE> to start the demonstrator's C shellor <CODECLASS="literal">sh</CODE>&nbsp;<CODECLASS="literal">-iv</CODE> for a Bourne shell.</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="ch13_11.htm"TITLE="13.11 tpipe-Redirecting stdout to More than One Place "><IMGSRC="gifs/txtpreva.gif"SRC="gifs/txtpreva.gif"ALT="Previous: 13.11 tpipe-Redirecting stdout to More than One Place "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="ch13_13.htm"TITLE='13.13 The "Filename&quot; 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