There are some informations which are absolutely needed in order for you to start up as a HET [l]user.
man: an interface to the on-line reference
manuals;apropos: search the manual page names and
descriptions;ls: list directory contents (files);cp: copy files and directories;mv: move (rename) files;rm: remove files or directories;mkdir: make directories;clear: clear the terminal screen;df: report filesystem disk space usage;du: estimate file space usage;pwd: print name of current/working directory;ps: report process status.|prompt> man command, where command is any
*nix valid command name, e.g.: ls, man,
cp, rm, etc...
ssh to one
machine, called now.het.brown.edu, whose IP number is
128.148.26.45. Thus, if you are
luser@het.brown.edu, you can log in the HET cluster (from
the outside world) by means of the following command:
|prompt> ssh luser@now.het.brown.edu <ENTER> OR |prompt> ssh luser@128.148.26.45 <ENTER>If you want to be able to use X11 applications from within your secure connection, then the command to use is:
|prompt> ssh -X luser@now.het.brown.edu <ENTER> OR |prompt> ssh -X luser@128.148.26.45 <ENTER>This will enable [what is known as] X11 forwarding (tunneling).
For more information on the ssh and how to use it in MS Windows(R), take a look at HET help on ssh.
scp utility,
which will do everything over a secure (i.e., encrypted) connection. The
syntax is as follows: To get a file which is on
now.het.brown.edu, use
|prompt> scp luser@now.het.brown.edu:path_to_file path_to_new_file <ENTER>If you want to put a file on
now.het.brown.edu, use
|prompt> scp path_to_file luser@now.het.brown.edu:path_to_new_file <ENTER>In the same link as above you can find the analogous commands for MS Windows(R).
tcsh. Another historically popular shell is called
bash, but a novice luser will probably not see the
diferences...
If, at any point, you want to change your shell, use the
chsh command.
passwd. I
strongly urge you to take a look here:
HTML, postscript
or PDF, in order to find more detailed
information on how to choose good passwords! This is a
very important topic and cannot be stressed enough:
"Choose good passwords!" (Or your accounts will be
locked.)
.plan. This file will be shown whenever someone
finger you: |prompt> finger danieldf. For
instance, your .plan file can read something like this:
|prompt> cat .plan Daniel Doro Ferrante Office Phone: +1-401-863-3110 Office FAX: +1-401-863-2024 Web: http://olympus.het.brown.edu/~danieldf/ |prompt>
public_html. By default, the file shown in the browser is
called index.html and, you can see it under the following
URL: http://www.het.brown.edu/people/luser/.
who and w you can see which
lusers are connected to the same machine as you are, in that given
moment.
talk. Just use
talk abuser to ask for a "talk session". If your partner
chooses to accept your "call", he/she/it should answer with: talk
luser and voi'la, both of you will be able to "talk". Whatever
you type on your keyboard will show up on the the other user's screen
and vice-versa. Pushing the <ESC> key will present you with a menu
with some commands.
write, just type: |prompt> echo
"Hi" | write abuser.
now and type |prompt> lpr -Pcolorslide file
<ENTER> or |prompt> lpr -Pcolorpaper2 file
<ENTER> or |prompt> lpr -Pcolorpaper1 file
<ENTER>.
tcsh this is done with |prompt> setenv DISPLAY
machine:0.0 and, in bash this is done via
|prompt> export DISPLAY=machine:0.0. If you still have
problems and/or receive errors that look like
Xlib: connection to "olympus:0.0" refused by server Xlib: Invalid MIT-MAGIC-COOKIE-1 key Unable to open the display.you probably want to learn about the
xhost utility. The
crash course is: In the machine that you want to display the stuff, type
|prompt> xhost + <ENTER>. That should get you
going...
w command shows
your sessions and idle time), they are consuming resources that
could be used by someone else, thus, avoid this kind of
[mis]behavior. Also, avoid spreading your programs through the
nodes/machines of the cluster like a virus, unless you absolutely have
to! And, if you do so, remember that the nice and the
renice commands are our friends! So make a point
of learning how to use them properly. Under absolutely no ciscunstances
run your simulations on now.het.brown.edu! This is our main
login machine and should be left alone for that task. Any simulations
caught running on now will be terminated with no
previous warnings. For an analogous reason, the same is true for the
machine called later.het.brown.edu whose IP is
128.148.26.46. Remember: "Big Brother is always
watching you!" =;-) So be nice and considerate to other lusers. If you
want to learn more about netiquette, try the links:
