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"Linux Gazette...<I>making Linux just a little more <FONT COLOR="red">lovable!</FONT></I>"
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<IMG ALT="" SRC="../gx/adam/heart.png" WIDTH="30" HEIGHT="25">
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</H4>
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<P> <HR> <P>
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<center>
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<H1><font color="maroon">The Weekend Mechanic</font></H1>
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<H4>By <a href="mailto:n6tadam@users.purbeck.dorset.sch.uk">Thomas Adam</a></H4>
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<!--Begin Article-->
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<H2>Table of Contents</H2>
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<UL>
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<LI><A HREF="#preamble">Welcome to the June edition</A>
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<LI><A HREF="#lwmmail">The LWM mailbox</A>
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<LI><A HREF="#xwinmonitor">Linux Installation: Xwindow and monitors</A>
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<LI><A HREF="#xwindowing">Setting up and Customising Xwindow</A>
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<LI><A HREF="#closingtime">Closing Time</A>
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</UL>
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<HR NOSHADE width=100%>
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<!--=======================================================================================-->
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<!-- ** begin preamble ** -->
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<A NAME="preamble">
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<H2>Welcome to the June edition</H2>
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<P>Welcome back, this time to the June Edition of the <B>Linux Weekend
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Mechanic</B>.How have you all been?? I have been incrediably busy. You would
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not believe the amount of geology coursework that I have to do as part of my
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course. I can tell you one thing though....I hope that I never have to write
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about "the palaeographical environments that the wenlock limestone formed in,
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with relation to the fossil corals", ever again!!</P>
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<P>Anyhow, what have people been doing in Linux over the last four weeks?? I
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have been quite busy at school updating my bashscript <I>loop4mail</I>, to do
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with the squid filters on our two proxy servers. Also, the DLUG (Dorset Linux
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Users Group) had a "Linux Install Day", helping people to install Linux on
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their Desktop and Laptop computers!! Fifty people or so turned up for that,
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which was a great success. Pictures of their install day can be found at <A
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HREF="http://www.dorset.lug.org.uk">DLUG site</A></P>
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<P>I must also apologise about the lack of "depth" with this
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article. Things with school have been busier than I had expected!</P>
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<P>Anyway, I think that I have rambled on long enough now. Enjoy........</P>
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<HR NOSHADE width=100%> <!-- ** end preamble ** -->
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<!--=======================================================================================-->
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<!-- ** begin lwmmail ** --> <A NAME="lwmmail"> <H2>The LWM mailbox</H2>
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<P>What follows, is any e-mails that I received, related to the previous
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<B>Linux Weekend Mechanic</B>. See what you think.....</P>
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<PRE>
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From: Thomas Nyman
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To: "Thomas Adam", <n6tadam@users.purbeck.dorset.sch.uk>
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Sent: Friday, May 04,2001 10:33 AM
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Subject: Weekend mechanic
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I like the "mechanic"
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Two things that I would like to see explained are these.
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1) If I install windows I may have a number of problems but never with my
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monitor and graphical interface. Personally I have often experienced the
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problem that I cannot get Xwindows to show on the screen monitor in a satisfactory
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way, i.e its either way to big for my monitor or its way to small...I
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have so far not found an easy to understand explanation on how to remedy such a
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problem.
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2) It would be "darn nifty" if you could put in a section on how to login via telnet
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and run xwindows on another machine.
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Anyway, thanks, and keep up the good work,
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Thomas
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</PRE>
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<I>[Thanks for your e-mail Thomas. As you can see, I have written an article
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about setting up monitors under Linux! -- Thomas
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Adam (The Weekend Mechanic)]</I>
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<HR NOSHADE WIDTH=25%>
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<PRE>
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From: nomi <sahmad6@gmu.edu>
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To: "Thomas Adam", <n6tadam@users.purbeck.dorset.sch.uk>
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Subject: Linux Weekend Mechanic
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Date: 12 May 2001 16:05
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Hi, I read your article on LinuxGazette. Could you cover how to setup
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X, mainly the XF86Config file(s)? I'm a console guy and know what I
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need to know there, but when it comes to X (and editing it's
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settings)..I'm totally lost. Thanks.
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Syed N. Ahmad
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</PRE>
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<I>[Thank you for your e-mail, Syed. I have more or less done what you have
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suggested, except I might have gone into too much detail in some parts of X
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configuring and not in others....still, nevermind -- Thomas Adam (Linux Weekend
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Mechanic)]</I>
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<HR NOSHADE WIDTH=25% ALIGN="center">
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<PRE>
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From: Don Reid <donr@cvs.agilent.com>
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To: <n6tadam@users.purbeck.dorset.sch.uk>
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Subject: shell aliases
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Date: 08 May 2001 21:21
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Your article on "Customising the Shell Environment" has a lot
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of good info for people new to the command line.
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One point I would like to add is that you can get into a lot
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of trouble by aliasing over existing commands (rather than making
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up new names). If you run a script that uses one of these commands,
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your changes may alter the way it works.
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My preference is to retrain my fingers to type a new command.
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There are ways to restrict aliases to interactive shells, but
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those don't work for sources scripts.
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--
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Don Reid
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</PRE>
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<I>[Don raises a very good point here, and one which I neglected to mention in
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my article. I shall just re-inforce that point by saying that, you should
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<B>never ever</B> have alias titles as commands, because if a program calls a
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bash builtin command, strange things can happen. Thanks for that Don. A valid
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point. -- Thomas Adam (Linux Weekend Mechanic)]</I>
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<HR WIDTH=25% ALIGN="center">
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<PRE>
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From: root <ssfb@myrealbox.com>
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To: <n6tadam@users.purbeck.dorset.sch.uk>
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Subject: thank for the bash tip
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Date: 10 May 2001 13:24
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I tried the tip about the shortcut in .bashrc. At first it did not work;
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meaning: I was recieving the no command found ect... So after a reboot,
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it work perfectly and made some other shortcuts that worked at the first
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time or trial.
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I wonder what will be next? and I waiting to see it.
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Thank you for your time
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Sylvain.
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</PRE>
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<I>[Umm, that is a strange problem, Sylvain, as to why you had to reboot your
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machine for those changes to take effect. By Sourcing the file, bash should
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have picked up those changes immediately. Still I am glad that it all works ok
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now. Best of luck -- Thomas Adam (Linux Weekend Mechanic)]</I>
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<HR NOSHADE WIDTH=25% ALIGN="center">
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<PRE>
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From: Paul Rowland <paul_row@bellsouth.net>
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To: <n6tadam@users.purbeck.dorset.sch.uk>
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Subject: weekend mech
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Date: 02 May 2001 12:48
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Dude,
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Your comments are totally in geekdom. You rule!
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Paul
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</PRE>
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<I>[Hello Paul, thank you for the vote of confidence. I am glad that you liked
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the article!! I also like the use of your language "geekdom". I have never
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heard that expression until now!! Regards -- Thomas Adam (Linux Weekend
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Mechanic)]</I>
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<HR NOSHADE WIDTH=25% ALIGN="center">
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<PRE>
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From: Josef Moffett <josef.moffett@mauripharm.com>
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To: <n6tadam@users.purbeck.dorset.sch.uk>
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Subject: Your Cron bits and bobs
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Date: 08 May 2001 6:17
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Hi there Thomas,
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I've been using Linux now for about 3 years, and recently (about a year ago
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now - time really flys when you're having fun ;-) installed debian on an
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old 486 at home to give me a masq box and firewall for my small home
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network.
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All my machines run linux at some point, but generally (mainly because I am
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a flightsim maniac - fly II is out now, woo hoo) still am tied to windows. I
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am dying for flight gear to come out a bit more stable so I can run it on
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Linux!
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Anyway, back the email (sorry about the ramble). I've been looking for more
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info about Cron for ages now. I use the linux box as a local mailserver and
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newserver (using leafnode). The pop3 server seems to work on its own -
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although I do have a few quirks. Of course for this, I've got to get it
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dialing in every now and then.
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So far what I've done is to hijack (quite blatantly) the standard once a day
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cron script (by the name, strangly enough of "standard" ;-) and tell it to
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dialup using pon with a provider script with a very short timeout (30 secs).
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In my ip-up script i then add fetchmail and fetchnews.
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It works, but of course doesn't do it more than once a day, and reading
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through man cron.d and the like, didn't really get me much further. I've
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always got some wierd error. (I can't remember what it was, I think about
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permissions - despite using it as root, but not serious).
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Added to that, is the fact that it works (just less often than I'd like) and
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the addage does say, "if it ain't broke...". Anyway, your article looks like
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just the thing to get me to sort this out more professionally.
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And then, perhaps I'd need to find a way to increase the "quiet hours" at
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home so that I can find the time to work on the linux box (or anything else
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in the computers!) without my 19month son helping my efforts by banging away
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at the keys!
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Cheers, and thanks again
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JOE
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</PRE>
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<I>[Hi Joe, You sent me this nice long e-mail, which is really quite
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interesting. I am also glad that you are going to find cron of some use, and
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thus my article. Perhaps, you could insert a crontab entry which shutdown your
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machine, before your 19 year old son gets to your computer!!!! Keep in touch --
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Thomas Adam (Linux Weekend Mechanic)</I>
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<HR NOSHADE width=100%>
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<!-- ** end lwmmail ** -->
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<!--=======================================================================================-->
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<!-- ** begin xmonitor ** -->
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<A NAME="xwinmonitor">
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<H2>Linux Installation: Xwindow and monitors</H2>
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<P>Thomas Nyman in his e-mail (see above), raised a good point about how
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installing your monitor does not always work, when using Xwindow. Indeed, I had
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not really given it much thought, as I had always fixed it, without really
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thinking what I was doing.</P>
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<P>When I first installed Linux (all those years
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ago), I immediately booted into AnotherLevel (FVWM2), and realised that my
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screen resolution was set at 640x480, and that everytime I tried to open a
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window, I could not see enough of it to click to change any of the settings.
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What was going on??? I was sure that I had told it to use 800x600 screen
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resolution!! If you find that you have a similar problem, then I have a very
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quick fix.....</P>
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<P>1. Change to a spare terminal, by pressing
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<Ctrl><Alt><Fx> ("Fx" being a function key). Now log in as
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root</P>
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<P>2. Edit the file "/etc/XF86Config" using your favourite text
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editor.</P>
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<P>3. Because XF86Config varies with different Linux distributions,
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I cannot say specifically where the section is, but you want to find the
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section labelled <B>Screen</B> which should look something like this....</P>
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<PRE>
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Section "Screen"
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Driver "SVGA"
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SubSection "Display"
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Depth 8
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Modes "800x600" "640x480"
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EndSubSection
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SubSection "Display"
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Depth 16
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Modes "800x600" "640x480"
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EndSubSection
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SubSection "Display"
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Depth 24
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Modes "800x600" "640x480"
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EndSubSection
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SubSection "Display"
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Depth 32
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Modes "800x600" "640x480"
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EndSubSection
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Monitor "Primary-Monitor"
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Device "Primary-Card"
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DefaultColorDepth 8
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EndSection
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</PRE>
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<P>4. Now what you have to do, is to change the resolution for each colour
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depth that you will be using. To do this, you must edit the values next to
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"Modes". The syntax for this, is that the first value you come to is the one
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that is activated first, and then the second is a backup if the first value
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failed and so on.</P>
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<P>To tell X that you want to use a certain colour depth, you must also edit
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the value next to "DefaultColorDepth" to be whatever depth that you want.
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Note: that you can only specify one default colour depth!!</P>
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<P>So, if you will be running in 16bit mode with 800x600 display, then you
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would set the following, making sure that you specify the next resolution as a
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backup.
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<PRE> Modes "800x600" "640x480"</PRE>
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<P>And then, if you have not done so already, change the value of
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"DefaultColorDepth" to be <B>16</B></P>
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<P>And that is all there is to it. Save the file and then boot up your X
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display.</P>
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<P>I know that there are programs which can do this editing for you such as
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"Xconfigurator", but I find that editing the file myself is much quicker!!</P>
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<HR NOSHADE width=100%>
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<!-- ** end xmonitor ** -->
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<!--=======================================================================================-->
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<!-- ** begin xwindowing ** -->
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<A NAME="xwindowing">
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<H2>Setting up and customising Xwindow</H2>
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<P>This article may be of some use to those people who prefer the command line,
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but would like to use X, but don't know how to go about it.It may also be of
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use to those who are interested in getting X to work in a satisfactory
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manor. Now, I believe that this topic has been covered before in an early
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issue of the <B>Linux Gazette</B>, but as I was asked directly, I thought I
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would write the article anyway!!</P>
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<P>Firstly, you must decide how you are going to run your X display. There are
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two ways of doing this, either by entering a different run-level, which will in
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turn run an X login client such as <B>XDM</B>, <B>GDM</B>, or <B>KDM</B>, or by
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typing in the command <I>startx &</I> at the console, after you have logged
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in.</P>
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<P>The advantages of using the first method is that if you know that
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you will nearly always be using Xwindows then you won't have to worry about
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starting it yourself.</P>
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<P><B>KDM</B> has a nice feature that allows you to select a different Window
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Manager before you logon, which I have found quite useful. The configuration
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for this can be done from <B>KDE</B> itself, using the program "kcontrol". By
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clicking "Applications --> login". A screenshot of how to configure <B>KDM</B>
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can be seen below.</P>
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<IMG SRC="misc/adam/kdmscreen.jpg" ALIGN="center" ALT="kdm configuration">
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<P>The other alternative that I mentioned was to use <B>XDM</B>. This is the
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login client that I use, as it is simple!! This one takes a little more
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configuration that <B>KDM</B> but it is the one that I like to use.</P>
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<H2 ALIGN="left">The files</H2>
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<P>Here are a list of files that we shall be using, and they are all found in
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the directory: "/etc/X11/xdm". The files we shall be concentrating on, are the
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following:</P>
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<B>/etc/X11/xdm/Xresources</B><BR>
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<B>/etc/X11/xdm/Xservers</B><BR>
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<B>/etc/X11/xdm/xdm-config</B><BR>
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<B>/etc/X11/xdm/window-managers</B><BR>
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<H2 ALIGN="left">Customisation</H2>
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<P>I shall take each file in turn, explain that files role, and tell you the
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best way to customise it....</P>
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<B>Xresources</B>
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<P>This file allows you to customise the look and feel of the main login
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window. You can also set and disable certain keystrokes. This file is
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probably the most important to customise.</P>
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<P>While it may not be necessary for you to customise this file, I shall point
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out things that you can do, if you feel the need. I shall not be covering
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this file line by line, but most of the information in this file is quite
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self explanitory.</P>
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<P>1. To change the text at the top of the login box, edit the value thus:</P>
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<PRE>xlogin*greeting: Welcome to this console</PRE>
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<P>I have changed the "Welcome to this console" to <B>"Welcome to
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CLIENTHOST"</B>. This is so that I know, on my home network, which terminal I
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am using. The "CLIENTHOST" is actually a variable, which holds the first part
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of your hostname. Thus, in my case it is <I>Grangedairy</I>, but if you have
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not changed your hostname since you installed Linux, then most likely,
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"CLIENTHOST" will return <I>LocalHost</I></P>
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<P>Just as an aside, if you do want to change your hostname, edit the
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values stored in the "/etc/hostname", and in a file "/etc/sysconfig/network",
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if the latter exists. Note, for the changes to take effect, you will have to
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switch to run-level 6 (init 6)</P>
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<P>2. You can also change the colour of this greeting, to be whatever you like.
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Find the following:</P>
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<PRE>xlogin*greetColor: CadetBlue</PRE>
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<P>I have changed the "CadetBlue" value to something a little more
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vitalising....guess what it is?? No? It's "Yellow", and rather surprisingly, it
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looks good too.</P>
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<P>3. You can also change the width of various frames of the login window
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too:</P>
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<PRE>
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xlogin*borderWidth: 2
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|
xlogin*frameWidth: 0
|
|
xlogin*innerFramesWidth: 1
|
|
</PRE>
|
|
|
|
<P>The first , sets the overall border commandwidth of the login
|
|
screen. Experiment to see what a value looks like. I find that 2 looks ok, on
|
|
both my desktop and laptop machines.</P>
|
|
|
|
<P>The second command, sets the frame width of the border. I tend to leave it
|
|
at 0</P>
|
|
|
|
<P>The third command, set the inner frame width for each of the input fields in
|
|
the main login window, namely "Login" and "Password". When I edited this value,
|
|
I hated the outcome, as each of the boxes looked "embossed".</P>
|
|
|
|
<P>You can set things like the background colour of the main screen, and change
|
|
the colour of the error message "Login Incorrect":</P>
|
|
|
|
<PRE>
|
|
xlogin*failColor: red
|
|
*Foreground: black
|
|
*Background: #c0c0c0
|
|
</PRE>
|
|
|
|
<P>Thus, the first command is very self explanitory. It should also be said,
|
|
that when changing values of this type, one can either specify the name of the
|
|
file, or put the #RRGGBB format aswell.</P>
|
|
|
|
<P>The second and third commands, sets the foreground colour and background
|
|
colour respectively.</P>
|
|
|
|
<P>Thats it for this file. I am sorry if all of this seems rushed, but the
|
|
majority of the file is fairly straightforward. I just thought that I would
|
|
highlight some points of interest.</P>
|
|
|
|
<HR NOSHADE WITDTH=25% ALIGN="center">
|
|
|
|
<H2 ALIGN="left">Xservers</H2>
|
|
|
|
<P>There really isn't much to say about this file, other than this file allows
|
|
you to change virtual consoles. Although I would only advise changing these
|
|
settings if you know that the VT you are changing to does not have mingetty
|
|
running on it. I have had some interesting problems with this before!! If
|
|
you are uncertain, consult the settings in "/etc/inittab"</P>
|
|
|
|
<PRE>:0 local /usr/X11R6/bin/X :0 vt07</PRE>
|
|
|
|
<P>So, to customise this value, change the number(s) after "vt", to start X on
|
|
the virtual terminal of your choice. It is also worth noting that you can
|
|
also specify the colour depth to use, if you are using one other than that
|
|
set in the "/etc/XF86Config" file. To do this, append the following after
|
|
the "vt07" bit to look like this....</P>
|
|
|
|
<PRE>:0 local /usr/X11R6/bin/X :0 vt07 -bpp 16</PRE>
|
|
|
|
<BLOCKQUOTE><EM>
|
|
[I have xdm running two xservers, one on vt9 and the other on vt10.
|
|
The first one is mine. I chose vt9 because F9 the first key in the
|
|
third group of function keys. vt10 is for my roomates, so they can do
|
|
their thang without disturbing my idle session. My
|
|
/etc/X11/xdm/Xservers (on Debian) looks like this:
|
|
</EM><PRE>
|
|
:0 local /usr/bin/X11/X :0 vt9 -bpp 24 -deferglyphs 16 dpms
|
|
:1 local /usr/bin/X11/X :1 vt10 -bpp 24 -deferglyphs 16 dpms
|
|
</PRE><EM>
|
|
-Mike.]
|
|
</EM></BLOCKQUOTE>
|
|
|
|
<HR NOSHADE WIDTH=25% ALIGN="center">
|
|
|
|
<H2 ALIGN="left">xdm-config</H2>
|
|
|
|
<P>This file sets the various configurations of XDM, by invoking various files.
|
|
I have never had to customise this file, so I doubt if you will either!!</P>
|
|
|
|
<HR NOSHADE WITDTH=25% ALIGN="center">
|
|
|
|
<H2 ALIGN="left">window-managers</H2>
|
|
|
|
<P>This file holds a list of window managers that X will use. Note that you can
|
|
specify as many as you like, one after the other, line-by-line, but only the
|
|
top one will get executed. And, if it cannot find it, then it executes the
|
|
second one down, and so on. Thus my configuration is thus:</P>
|
|
|
|
<PRE>
|
|
|
|
/usr/bin/X11/AnotherLevel
|
|
/usr/bin/X11/twm
|
|
#file below symlinked from "/usr/openwin/bin/openwin"
|
|
/usr/bin/X11/openwin
|
|
</PRE>
|
|
|
|
<HR NOSHADE width=100%>
|
|
<!-- ** end xwindowing ** -->
|
|
<!--=======================================================================================-->
|
|
<!-- ** begin closingtime ** -->
|
|
<A NAME="closingtime">
|
|
<H2>Closing Time</H2>
|
|
<P>Well kind people, that concludes this months <B>Linux Weekend Mechanic</B>.
|
|
Thanks once again to everyone who took the time to send me an e-mail, praising
|
|
me, pointing out my areas of weakness, and giving article ideas. I am
|
|
currently working through all your article suggestions, so please bear with me.
|
|
Any more input that people can provide, is always welcome!! Keep those e-mails
|
|
flooding in please!!</P>
|
|
|
|
<P>Anyway, I must be going. I have still got to work on my chemistry (revising
|
|
the reaction conditions necessary to reduce a carboxylic acid to an alcohol
|
|
using Lithiumaluminiumhydride, I think). I have then got to go and teach piano,
|
|
and do some much needed Geography work. It is all go!!</P>
|
|
|
|
<P>In the meantime (and as like last weeks' ending)<B>Happy
|
|
Linuxing....</B></P>
|
|
<!-- ** end closingtime ** -->
|
|
<!--=======================================================================================-->
|
|
<HR NOSHADE WIDTH=100%>
|
|
<!-- ** Begin table comments, etc. Oh wakey wakey you idiot Thomas ** -->
|
|
<TABLE BORDER=0 ALIGN="center" WIDTH=60%>
|
|
<TH></TH>
|
|
<TH></TH>
|
|
<TH></TH>
|
|
<TR>
|
|
<TD WIDTH=10%><IMG ALT="" SRC="../gx/adam/mail.png" ALIGN="left" WIDTH="64" HEIGHT="64"></TD>
|
|
<TD WIDTH=80% ALIGN="center"><FONT COLOR="red" SIZE="5">Send Your Comments</FONT></TD>
|
|
<TD WIDTH=10%><IMG ALT="" SRC="../gx/adam/mail.png" ALIGN="left" WIDTH="64" HEIGHT="64"></TD>
|
|
</TR>
|
|
</TABLE>
|
|
|
|
<P ALIGN="center"><FONT SIZE="4">Any comments, suggestions, ideas, etc can be
|
|
mailed to me by clicking the e-mail address link below:</FONT><BR>
|
|
<A
|
|
HREF="mailto:n6tadam@users.purbeck.dorset.sch.uk"><n6tadam@users.purbeck.dor
|
|
set.sch.uk></A></FONT></P>
|
|
|
|
|
|
|
|
|
|
<!-- *** BEGIN bio *** -->
|
|
<SPACER TYPE="vertical" SIZE="30">
|
|
<P>
|
|
<H4><IMG ALIGN=BOTTOM ALT="" SRC="../gx/note.gif">Thomas Adam</H4>
|
|
<CITE>My name is Thomas Adam. I am 18, and am currently studying for A-Levels
|
|
(=university entrance exam). I live
|
|
on a small farm, in the county of Dorset in England. I am a massive Linux
|
|
enthusiast, and help with linux proxy issues while I am at school. I have been
|
|
using Linux now for about six years. When not using Linux, I play the piano,
|
|
and enjoy walking and cycling.</CITE>
|
|
|
|
|
|
<!-- *** END bio *** -->
|
|
|
|
<!-- *** BEGIN copyright *** -->
|
|
<P> <hr> <!-- P -->
|
|
<H5 ALIGN=center>
|
|
|
|
Copyright © 2001, Thomas Adam.<BR>
|
|
Copying license <A HREF="../copying.html">http://www.linuxgazette.com/copying.html</A><BR>
|
|
Published in Issue 67 of <i>Linux Gazette</i>, June 2001</H5>
|
|
<!-- *** END copyright *** -->
|
|
|
|
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|
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