IT 244: Introduction to Linux/Unix

IT 244: Introduction to Linux/Unix
Homework 6

Due

Sunday, October 13th at 11:59 PM

What You Need to Do

Create the script hw6.sh with Unix commands that will do what is described in the steps below
This file must be in an hw6 directory under your hw directory

Setup

From your home directory go to your it244 directory
```
cd it244
```
Go to your hw directory
```
cd hw
```
Create an hw6 directory
```
mkdir hw6
```
Enter this new directory
```
cd hw6
```
Create hw6.sh
```
nano hw6.sh
```

Specification

Create the file hw6.sh inside your hw6 directory using nano
Write the Unix command to perform the action specified by each step
Be sure to write a Step comment before the Unix commands for each step

Run a command which will show how much free space exists on the file system.
You must use an option which will show the space in a way that is easy for human beings, like us, to understand.
Run cat with an option that prints to the terminal a help message for this command.
Print to the terminal the value of a variable that shows where the shell will look for an executable file to match the command you typed at the terminal.
In ~ghoffman/course_files/it244_files there is a file named hello.sh.
Stay in your hw6 directory and run hello.sh using an absolute pathname.
Because this script is executable, you do not need to type bash when running it.
If you run this script using bash on the command line, you will lose points.
Copy hello.sh to your hw6 directory using the same pathname you used above.
Run this copy of hello.sh using a relative pathname.
You must do this while staying in your hw6 directory.
In the directory /home/ghoffman/course_files/it244_files, you will find a red_sox.txt file.
Stay in your hw6 directory.
Using redirection run grep on red_sox.txt to find all games the Red Sox have won and sending the results to the file red_sox_wins.txt.
DO NOT COPY red_sox.txt to your hw directory.
List the contents of your current directory.
Print to the terminal the exit status of the command you just ran.
Try to list the contents of a directory that does not exists like xxxxxxx.
Print to the terminal the exit status of the command you just ran.
Stay in your hw6 directory.
Using ls and output redirection, create a file named dir_listing.txt that contains the list of files and directories in your home directory.
Stay in your hw6 directory.
Using redirection, create a file named list.txt containing a list of all the users currently logged in.
Stay in your hw6 directory.
Using redirection, add a listing of the contents of your hw6 directory to dir_listing.txt.
That is, I want you to keep the original contents of dir_listing.txt intact while running ls of your current directory to it.

Testing

There are two tests that your should run on your script
The first test checks for Unix errors
Run bash on your script like this
```
bash hw6.sh > /dev/null
```

You can ignore the following error message

ls: cannot access 'xxx': No such file or directory

This will run your script but will only show error messages
If you see nothing, your script has passed this test
The second test checks your Step comments

Run it like this

~ghoffman/code/it244_code/testing_scripts_it244/step_comment_check.sh

If your Step comments are wrong you will lose points