IT 244: Introduction to Linux/Unix
Homework 3

Due

Sunday, September 22nd 11th at 11:59 PM

What You Need to Do

• Create a text file named .plan in your home directory
• Create the script hw3.sh with Unix commands that will do what is described in the steps below
• This file must be in an hw3 directory under your hw directory

Setup

• Create a .plan file in your home directory

  nano  .plan

• From your home directory go to your it244 directory

  cd it244

• Go to your hw directory

  cd hw

• Create an hw3 directory

  mkdir hw3

• Enter this new directory

  cd hw3

• Create hw3.sh

  nano hw3.sh

Specification

.plan

• Go to your home directory
• Use nano to create the file .plan
• Enter some information about yourself in this file
• The text in this file will appear when finger is run on your Unix ID or name

hw3.sh

• Run nano to create hw3.sh
• Into this file write the Unix commands for each step
• The commands for each step must by labeled with a Step number
• Write # followed by the word "Step" and the step number
• # indicates a comment
• Anything after this character is ignored when bash runs your script
• There MUST be a blank line between the last Unix command for a step and the next Step comment
• I have many assignments to score
• So I need all your script files to follow certain rules
• You will find them here
• If you do not follow the rules you will lose points

1. Go to the directory /home/ghoffman/course_files/it244_files.
   Using grep and pipes, | on the file red_sox.txt, select all the Red Sox away games where they won, except for the games they played against the Orioles
   Away games are indicated by the @ symbol
2. Print to the terminal the contents of foo.txt, selecting only those lines with the word "foo" as a whole word
   In other words, "foo" must NOT appear as part of another string, like "foobbbbbbbb".
   There is an option for grep that tells it to only match the string when it appears as a word, not as part of a bigger string
   Check the man page for grep to find this option
   Don't call the man page from within your shell script.
3. Use head and tail to print to the terminal lines 11 through 15 in numbers1.txt
4. Use sort to print to the terminal the contents of numbers1.txt in reverse numerical order
5. Use diff to print to the terminal the differences between numbers1.txt and numbers2.txt in a human readable format
6. Consult the man page for date, then use this command to print to the terminal the date in the format yyyy-mm-dd.
   Don't call the man page from within your shell script.
7. Print to the terminal the location of the executable file for perl, a scripting language. The command you use should only work for executable files
8. Run finger on your Unix username to print to the terminal the information you entered in your .plan file

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 hw3.sh > /dev/null

• 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

Output

• Your output should look something like this
• Except the output of finger will look different

$ bash hw3.sh 
2011-07-02      Red Sox @  Astros       Win 7-5
2011-07-03      Red Sox @  Astros       Win 2-1
2011-07-16      Red Sox @  Rays         Win 9-5
2011-07-17      Red Sox @  Rays         Win 1-0
2011-07-30      Red Sox @  White Sox    Win 10-2
2011-07-31      Red Sox @  White Sox    Win 5-3
foo
foo
11
12
13
14
15
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1							      <
2							      <
3							      <
4								4
5								5
6								6
7								7
8								8
9								9
10								10
							      >	11
							      >	11
11								11
12								12
13								13
14								14
15								15
16								16
17								17
18								18
19								19
20								20
2022-09-27
/usr/bin/perl
Login: ghoffman       			Name: Glenn Hoffman
Directory: /home/ghoffman           	Shell: /bin/bash
On since Tue Sep 27 10:52 (EDT) on pts/30 from 172.18.20.39
   4 seconds idle
On since Tue Sep 27 12:37 (EDT) on pts/33 from 172.18.20.39
   5 minutes 58 seconds idle
Mail forwarded to glenn.hoffman@umb.edu

New mail received Fri Jul  8 13:31 2022 (EDT)
     Unread since Fri Jul  8 13:30 2022 (EDT)
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