Installing and Using SSH
         (do after installing python using pacman or brew)

SSH stands for "secureshell", a program that allows you to remotely log in
to another host, and to transfer files once logged in.  If you have a Mac
or are running Linux, then this utility should already be installed.  On
a PC running windows, you can also use the 'pacman' program to install additional software.  In the msys command window execute

 pacman -S openssh

This will install a "ssh client," which allows you to log into machines that
are also running an "ssh server," which you don't need right now.

If by some chance you have a MAC but don't have ssh (type ssh on the
command line to see if it recognizes the command), you can install it
using the same 'brew' tool that you used to install python: 
brew install openssh


USING SSH and SFTP

The two command line programs that are installed with openssh are ssh and sftp.
ssh allows you to remotely log in to a server and execute shell commands,
while sftp allows you to transfer files.

SSH:

Type

 ssh -l username -p 5010 147.4.180.112

If this ip address doesn't work try one of the following:

  147.4.180.108
  147.4.180.109
  147.4.180.110
  147.4.180.111
  147.4.180.113
  147.4.180.114

Each of these ip addresses belongs to one of the workstations in Adams 204,
and you can find your home directory 'mounted' on any of them.

You'll be prompted for your password.  After you log in you will get the
$ shell prompt where you can enter shell commands such as cd, ls, pwd, etc.
you can also run python3.4.  However, you will only be able to use a 
command-based editor.  Type

 emacs -nw filename

to start emacs text-only mode.  To use emacs in this mode you will have
to know the keyboard commands for emacs:

  Cntrl-xs: save file  (hold down control key and type xs)
  Cntrl-xf: find/open file
  Cntrl-xb: switch between buffers
  Cntrl-x2: splits window (Cntrl-x1 makes it a single window again)
  Cntrl-g:  reset (do this when something goes wrong)
  Cntrl-p:  move cursor up  (can also use arrow keys)
  Cntrl-n:  move cursor down
  Cntrl-f:  move cursor right
  Cntrl-b:  move cursor left  
  Cntrl-v:  page down
  Esc-v:    page up
  Cntrl-k:  erase line of text, saves in buffer
  Cntrl-y:  pastes text saved in buffer:
  Cntrl-s:  search for a piece of text
  Esc-x, then type 'goto-l' at the bottom to jump to a line number.
  Esc % : query replace text with other text (type esc and then %)
  Cntrl-x u : undo last edit (Control-x, then u separately)
  Cntrl-xc: quit emacs (return to shell)

To log out from the ssh session, type exit


SFTP

  This program allows you to transfer files between a ssh client and a
ssh server.  In the shell prompt type

 sftp -P 5010 username@147.4.180.108  

after logging in, you will get a 'sftp>' prompt.  Here are some commands you
can use under the prompt:

pwd :  prints current directory in the REMOTE machine
lpwd:  prints current directory in the LOCAL machine (your own machine)
cd : change directory on the remote machine
lcd: change directory on the local machine

After getting to the right directories remotely and locally:

get filename  :  download a file from remote to local
put filename  :  upload a file from local to remote

exit  : quits sftp session (returns to shell).

Please practice these skills.