Power Computing at CMU

ssh $ANDREWID@unix.andrew.cmu.edu

This is a shell. You type commands into it, and it does things. The Linux Command Line is a good tutorial about how to use the shell. If you have questions or want personal tutoring, come to Computer Club meetings. Today, we will keep it to the stuff that will make you "more productive".

ls # list files in current directory
pwd # print current directory
ls dir # list files in directory
cd dir # go to directory
cd .. # go to parent directory
cd . # go to current directory
# .. and . are generic ways to refer to parent/current so you can pass them to anything
# so we can do:
ls . # list files in current directory
ls .. # list files in parent directory

Ctrl-r: Incremental search for old commands - press Ctrl-r again to go further back.
Up arrow: Go to last command
TAB: Complete the name of commands, filename paths, arguments, all kinds of stuff

If you setup your work environment inside tmux, it will all be there waiting for you when you come back. You can run long-running process inside it too, so they keep running even when you're logged out.

Run "tmux" to start tmux and enter it, and thereafter run "tmux attach" when you log in. Or use this handy alias:

alias atch=tmux attach -d || tmux

Ctrl-b c (create a window)
Ctrl-b n/p (move to next and previous windows)
Ctrl-b 0-9 (move to window with that number)
Ctrl-b d (detach from tmux so you can log out)

IRC makes you more productive!

irssi

You will see a scary screen.

/connect chat.freenode.net
/join ##cclub

There is much assistance available on IRC. But make sure to wait after asking a question… (Or heck just ask questions right now on IRC)

A good guide for irssi is https://quadpoint.org/articles/irssi/

All that is great, except unix.andrew.cmu.edu reboots every 24 hours. This is annoying if you want to run something persistent… like tmux. So join Computer Club! We provide shell servers that don't reboot every 24 hours!

It is an authentication system. Here, read this: http://web.mit.edu/kerberos/dialogue.html

kinit $ANDREWID@andrew.cmu.edu # type in your password
klist # see that you are authenticated

Put the following text in this file on your local machine: ~/.ssh/config

Host andrew
   Hostname unix.andrew.cmu.edu
   User ANDREWID
   GSSAPIAuthentication yes
   GSSAPIDelegateCredentials yes

ssh andrew # no password!

Put files in here: ~/www

And they will show up in here: http://www.contrib.andrew.cmu.edu/~$ANDREWID/

Instructions on the Contrib homepage.