[Courses] [Networking] Lesson 1

PRIOUR Gaetan priour.gaetan at ifrance.com
Wed Mar 19 20:59:54 EST 2003

i did 'man su'

it says :
All attempts, both valid and
       invalid, are logged to detect abuses of the system.

Where is it logged ?

On Wed, 19 Mar 2003 17:40:22 +0100
Hamster <hamster at hamsternet.org> wrote:

> LESSON 1 - Welcome!
> It's no longer uncommon for households to have more than computer. The goal
> of this course is to network these PCs, share files between them and to
> enable them to all connect to the internet.
> This mailing list serves as the classroom. I'll publish the lessons to the
> list, and you reply with any problems or questions. Just make sure all
> correspondence contains the expression [Networking] in the subject line. You
> can also use the linuxchix IRC server as a meeting point to discuss issues. 
> If you're looking for me, provided I'm online you'll find me in the channel
> #tech.
> Throughout this course we'll be using the command line. I'm sure I just
> heard groans of dismay and the clicking of delete buttons. There are very
> good reasons for using something perceived as being difficult to learn and 
> archaic.
> 1. In the first place, it's not hard to learn, it's certainly not old
> fashioned, and if you think you can use the excuse of 'being a poor typist',
> even that argument is invalid!
> 2. It's uniform across every linux distro. If I were to teach this course by
> relying on a GUI, I'd have to include separate instructions for each distro!
> To make matters worse, it's possible for the same GUI on the same version of
> the same distro to look completely different.
> ## Becoming Root ##
> When administering a linux system, 99% of the time you need to be the user
> root. The common way to become root is to use the programme "su". Using
> plain old "su" does however have one drawback, and any instructions I
> provide assume that you became root by typing "su -" (thats su and then a
> dash).
> In future lessons when I use the phrase "become root and do foo", you are to 
> interpret this as meaning: "at the command prompt, execute "su -" to become 
> root and then execute the programme "foo".
> ## Editing Files ##
> We'll spend a fair amount of time editing and tweaking config files. To do
> this you need a text editor. The larger word processing programmes (Such as
> Star Office, KOffice) are not suitable for our purposes. When you use a word
> processor to save a file, it includes hidden text alongside what you wrote.
> This hidden text is used by the word processor to indicate things like
> indenting, underlines, margin widths etc. Great for documents meant to be
> read by humans, but capable of really, really ruining your day when you want
> the computer to read it. There are a few plain text editors available, the
> two most popular ones being Emacs and vi. If you're already familiar with
> either of these two, great - keep on using them. If you don't already have a
> preferred editor, then I suggest you download and install a programme called
> nano. Its download page has tarballs, deb packages and rpm packages (the
> page says the rpm is for RedHat 8, but it also works perfectly with Mandrake
> 9) <http://www.nano-editor.org/download.html>
> Because I don't want to force anyone to use any one particular editor, in 
> subsequent lessons I'll simply say "edit foo". This means: "using your 
> editor of choice, open the file foo, make the indicated changes, save and 
> exit".
> Tip: If you're not 100% confident in editing config files, make a backup
> copy first. That way if things go pear shaped you can just delete the messed
> up file and start again. For example:
> I tell you to edit the file /etc/foo.conf
> 1. Create a backup copy by 
> cp /etc/foo.conf /etc/foo.conf.bak
> 2. edit the file /etc/foo.conf
> If something goes wrong, all you need to do is:
> cp /etc/foo.conf.bak /etc/foo/conf
> and you can start all over again.
> ## Homework ##
> 1. If you don't understand the difference between "su" and "su -", have a
> read of the manpage for su (man su) and write to the list asking about
> things in the manpage you don't understand.
> 2. Decide on a text editor, and make sure you can open a file, edit it and
> save it.
> 3. If you're mystified by the command line, write to the list and say so.
> I'm happy to go through some command line basics, but only if people need
> it!
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