IT 244: Introduction to Linux/Unix
Class 6 Exercise, Tuesday/Thursday, February 16/18th

Log in to pe15.

• Run the ssh client
  

  Use the values in the table below to connect to pe15.

  ssh configuration parameter	value
  protocol	ssh
  ssh version	2
  ssh port	22
  host	pe15.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.

Directory for this Exercise

• Make sure you are in your home directory
  

      cd

• Go to your it244 directory

      cd  it244

• Go to your ex directory
  

      cd  ex

• Create an ex06 directory
  

      mkdir  ex06

• Go to your ex06 directory
  

      cd  ex06

Create a typescript File

• Make sure you are in your ex06 directory
  

      pwd

  If the result of running this command is not

      ~YOUR_UNIX_USERNAME/it244/ex/ex06

  where YOUR_UNIX_USERNAME is the name you created for your Unix account, see me.
• Run the script command
  

      script --flush

  This will create a typescript file in your ex06 directory.
  
  You must perform the remaining steps in this exercise while script is still running.
  
  If you make a mistake, simply try again.
  
  Do not exit the script session until you have finished all the steps in this exercise.

file

• Return to your home directory

      cd

• Run file on the contents of your home directory

      file * 

• Look at the files in my it244_files directory

      file /home/ckelly/course_files/it244_files/*

Pipes

• Make sure you are in your home directory
  

      cd

• Go to your ex06 directory
  

      cd it244/ex/ex06

• Make sure you are in your ex06 directory
  

      pwd

• Copy red_sox.txt to your home directory
  

      cp  /home/ckelly/course_files/it244_files/red_sox.txt  .

  Make sure you include the dot,  . , or you will get an error message.
  
  
• Make sure the copy operation worked
  

      ls

• Find all Red Sox wins
  

      grep Win red_sox.txt 

• Find all Red Sox wins at home
  

      grep Win red_sox.txt | grep vs

  Here, the first instance of grep is the source, and the second is a filter.
  
  
• Find all Red Sox wins at home, sorted in reverse order by date
  

      grep Win red_sox.txt | grep vs | sort -nr

  This is a pipeline, with three separate processes, one for each command.
  
  

date

• Show today's date
  

      date

• Use the formatting options of date to show today's date using the format YYYY-MM_DD
  

      date +"%Y-%m-%d"

which

• Find the executable file for the Python interpreter

      which python

• Find the executable file for tar

      which tar

whereis

• Find files associated with python

      whereis python

  Note that whereis reveals many more files.
  
  
• Find files associated with tar

      whereis tar

locate

• Find all files with "foot" in their name

      locate foot

who

• Find out who else is logged in to pe15

      who

• Look at the details of your current session

      who am i

finger

• Use finger to see who else is connected to your current host

      finger

• Use finger on your own Unix username

      finger YOUR_UNIX_USERNAME

  In place of YOUR_UNIX_USERNAME, you must put your Unix username.
  
  
• Run finger on the first name "Chris"

      finger Chris

End your script Session

• Exit from your script session
  

      exit

  You need to do this or the typescript file will never be created
• Look at the contents of the typescript file
  

      cat  typescript

Bash Script for this Exercise

• Go to your ex06 directory
  

      cd ~/it244/ex/ex06

• Make sure you are in your ex06 directory
  

      pwd

  If not, see me.
  
  
• Create the script ex06.sh
  

      nano ex06.sh

• Write into this file all the commands from the sections above
  
  Copy all the commands from the sections file to finger.
  
  Do not call nano inside your script.
  
  
• Save this file
  
  Save and quit.
  
  
• Test the script
  

      bash ex06.sh

  Fix any errors you find.
  
  If you have trouble, see me.