IT 244: Introduction to Linux/Unix

IT 244: Introduction to Linux/Unix
Class Exercise 2

Logging in to users3

We'll be using the Windows machines in this room, or your laptops , to connect to the Linux machine users3 for all the class exercises in this course.

Install putty.exe if you have a Windows machine
Download it from https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html.
For more information go to https://www.cs.umb.edu/~tsoro/teaching/linux/remote_access_windows.html
Run the Terminal program if you have a Mac
You will find this program in the Utilities directory inside the Applications directory.
For more information go to https://www.cs.umb.edu/~tsoro/teaching/linux/remote_access_mac.html

Run the ssh client
Use the values in the table below to connect to the virtual machine we'll be using in this class.

In the value for "host" listed below, the first part of the string, "users3", specifies the machine, on the Unix network, that you will connect to.

ssh configuration parameter	value
protocol	ssh
ssh version	2
ssh port	22
host	users3.cs.umb.edu
user name	your Unix username
Authentication method	password

Enter your password
A dialog box will appear on the screen into which you must type the password for your Unix account.

Confirm that you are connected
You should see the following

Welcome to Ubuntu 16.04.1 LTS (GNU/Linux 4.4.0-59-generic x86_64)

Learn More About the Machine to Which You Are Connected
The uname command displays information about the machine you are using.
```
uname -a
```
When used with the -a option, uname displays more information than just the name of the machine.

Your Shell

Determine Your Current Shell
The easiest way to determine your current shell is to use the ps (process status) command.
```
ps
```
The ps command shows all your running processes, including your shell, bash.

Explore Your Home Directory

Learn Your Current Location
At every point in your Unix session, you are working inside some directory.

When you log in, you will be in your home directory.

You can create subdirectories inside your home directory, and customize your environment through special files located here.

To determine your current location, you will use the pwd command, which stands for "print working directory".
```
pwd
```
Notice that your home directory has the same name as your username, and is located inside /home.

This is true for all users.
Look at the Contents of Your Home Directory
The ls command (for "list"), when used with no arguments, will display the contents of your current directory.
```
ls
```
You should see at least one directory - it244.

You will use this directory for all your class assignments.
Look at Your "Invisible" files
Normally ls will not show files whose first character is a . (dot).

These are special files used to change features of your Unix environment.

To see these files, you need to use ls with the -a option:
```
ls -a
```

Create directories for your homework and Class Exercises

Make sure you are in your home directory
```
	cd
```
Go to your it244 directory
```
	cd it244
```
Create an hw directory
```
	mkdir hw
```
Create an ex directory
```
	mkdir ex
```
Check that the directories were created
```
	ls
```
You should see two directories hw and ex

Wrap Up

Tell me when you have completed this Class Exercise
I need to check your work
Disconnect from users3
```
exit
```