Today's Class Exercise

• The Class Exercises are designed to give you hands on experience
• All work for this course will be done on the Unix machine pe15
• In this exercise you will learn three things you need for this course
  • Connecting to a Unix machine
  • Creating directories for your class work
  • Creating a Bash script
• I have created a video which demonstrates the last two topics

Log in to pe15

• 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/~ghoffman/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/~ghoffman/linux/remote_access_mac.html
• Run an SSH client
  Run if you have a PC.
  Or Terminal if you have a Mac
• Enter appropriate information
  You want to connect to pe15.cs.umb.edu.
  If you need a port number use 22.
  The account name is the name you used when you ran the apply program.
• Enter your password

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

• Go to your home directory
  

  cd

• Go to your it244 directory
  

  cd  it244

• Create the ex directory
  

  mkdir  ex

• Check that the directory was created
  

  ls

• Create the hw directory
  

  mkdir  hw

• Check that the directory was created
  

  ls

• Go to your ex directory
  

  cd ex

• Make sure you are in your ex directory
  

  pwd

  If you are not in /home/UNIX_ID/it244/ex, see me.
• Create a directory for this exercise
  

  mkdir  ex2

• Check that the directory was created
  

  ls

• Go to this new directory
  

  cd ex2

Create a File

• Create the file ex2.sh
  

  touch ex2.sh

  touch is a command with a special purpose.
  
  We will use it to quickly create a file for testing.
• Make sure the file was created
  

  ls

  You should see the file you just created.

Running my test script on your script

• If you want to run my text script on your Class Exercise script do the following
• Run ex02.sh on your script
  

  ~ghoffman/it244_test/ex02.sh

  The script will prompt you for your Unix username.