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KIT213 Operating Systems
Semester 2, 2020
Assignment Two – UNIX Shell Programming
(20% of your KIT213 final result)
Due at 3pm Friday Week 13, 16 October 2020
There are three (3) shell programming tasks in this assignment. This is an
individual assignment. You are required to make a directory named
kit213a2 under your home directory (on alacritas), and use kit213a2
as your working directory for this assignment.
Assignment submissions will be marked by the KIT213 tutors on alacritas
(also known as ictteach). If you write and test your scripts elsewhere it's
your responsibility to ensure that your scripts run correctly on the School
UNIX system (alacritas).
Task A
Write a shell script (to run on the Bourne shell) to copy all the files from the
directories named dir1 and dir2 into a new directory named dir3. Time
stamps must be preserved while copying files from one directory into
another.
(1). In the beginning of your script you need to check that the directories dir1
and dir2 exist under the current directory (if not, your script displays an
error message and then exits).
(2). All the three directory names are supplied as arguments, and the new
directory dir3 must not currently exist (ie, the creation of dir3 is part of the
script).
(3). The script first copies all the files from dir1 into dir3.
(4). The script then copies every file from dir2 to dir3 subject to these
conditions: if the file from dir2 is not already present in dir3, or if the dir2
file is newer than the same dir3 file it will overwrite its namesake in dir3.
(5). Remove all the temporary files (if any) at the end of your script.
Page 2 of 10
(6). Your script must generate an output similar to the sample output shown
below.
Hint: You should note that the cp command without any option does not
preserve certain attributes (such as ownership and timestamps).
Your script for this task must be named cp2.sh. Make sure that your script is
user-friendly and follows common sense. The following is a sample output of
the script. The $ is the shell prompt.
$ ./cp2.sh dir1 dir2 dir3
These files from dir1 copied into dir3:
a.c b.c file1.c
These new file(s) from dir2 copied into dir3:
file2.c
These file(s) from dir2 copied into dir3 and overwrite(s) their
namesakes in dir3:
a.c
The following sample outputs verify the above result:
$ ls
cp2.sh dir1 dir2 dir3
$ ls -l dir1
total 12
-rw-r--r-- 1 sxu staff 9 Aug 2 12:52 a.c
-rw-r--r-- 1 sxu staff 9 Aug 2 12:52 b.c
-rw-r--r-- 1 sxu staff 9 Aug 2 12:52 file1.c
$ ls -l dir2
total 12
-rw-r--r-- 1 sxu staff 9 Aug 2 12:53 a.c
-rw-r--r-- 1 sxu staff 9 Aug 2 12:51 b.c
-rw-r--r-- 1 sxu staff 9 Aug 2 12:53 file2.c
$ ls -l dir3
total 16
-rw-r--r-- 1 sxu staff 9 Aug 2 12:53 a.c
-rw-r--r-- 1 sxu staff 9 Aug 2 12:52 b.c
-rw-r--r-- 1 sxu staff 9 Aug 2 12:52 file1.c
-rw-r--r-- 1 sxu staff 9 Aug 2 12:53 file2.c
(Continued next page)
Page 3 of 10
Task B
Write a shell script (to run on the Bourne shell) that runs an infinite loop to
monitor which users on a denial list have logged into the UNIX system more
than once.
(1). The denial list must be stored in a text file named user.deny which lists
which users are not allowed multiple logins, specified by one username per
line.
(2). In the beginning of the script you need to check that the user.deny file
exists under the current directory, and if not, your script displays a message
to say so and then exits.
(3). Every 3 seconds, the script must display a warning message to report
users on the denial list who have logged in multiple times. Display the user’s
full name instead of his/her username in the warning message.
(4). It’s unnecessary for your script to handle the situation where a user logs
in and then logs off immediately (i.e. within a 3 second interval).
Your script for this task must be named mlog.sh. The following is a sample
output of the script (It is OK if the script leaves behind temporary files when
it is finally interrupted). The $ is the shell prompt.
$ ./mlog.sh
No user on the user.deny list has multiple logins
No user on the user.deny list has multiple logins
The user John Smith (on the denial list) has logged in more than
once!
The user Adam Jones (on the denial list) has logged in more than
once!
No user on the user.deny list has multiple logins
No user on the user.deny list has multiple logins
The user David Monks (on the denial list) has logged in more than
once!
The user Nick Andrews (on the denial list) has logged in more than
once!
… … … … … … … … … … … … … … … …
Page 4 of 10
Task C
Dominion Consulting in Sydney needs a shell script (to run on the Bourne
shell) to maintain its employee records file, which contains the following
information about each employee: telephone number (8 digits, first digit nonzero),
family name (alphabetic characters), first name (alphabetic characters),
department number (2 digits), and job title (alphabetic characters). This script
should let users add, delete, search for, and display specific employee
information.
(1). Create a text file named records containing the following records with
fields delimited by colons:
95671660:Jones:Sarah:45:sales manager
93272658:Smith:John:43:technical manager
98781987:Williams:Nick:35:computer officer
99893878:Brown:Sarah:12:electrician
95673456:Couch:David:26:chef
95437869:Anderson:Sarah:19:CEO
(2). In the beginning of your script you need to check to see whether the
required text file (records) actually exists under the current directory (if not,
your script displays a message and then exits).
(3). Your script (must be named menu.sh) will present a menu of operations
that a user may choose from. Among other tasks, these operations automate
the following four activities:
1. Displaying all current employee records on the screen.
2. Searching for and displaying specific employee record(s) (search all
fields, ignoring case)
3. Adding new records to the records file.
4. Deleting records from the records file.
(4). Your script must produce the following menu:
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Q - Quit
Page 5 of 10
(5). After a user makes a selection and that the selected operation has been
completed, the menu must be displayed again so that the user can make
another selection.
(6). You must validate the employee details when adding a new record.
(7). A valid family name, first name and job title must be alphabetic characters
and/or spaces. The first digit of a valid phone number (of eight digits) must
not be zero. Each telephone number must be unique. A valid department
number must only contain 2 digits.
Here is a sample output of your script. The $ is the shell prompt. The items in
italics are not part of the sample output. They are hints indicating how your
script should behave.
$ ./menu.sh
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Q - Quit
Your Selection: 1(user input)
95671660:Jones:Sarah:45:sales manager
93272658:Smith:John:43:technical manager
98781987:Williams:Nick:35:computer officer
99893878:Brown:Sarah:12:electrician
95673456:Couch:David:26:chef
95437869:Anderson:Sarah:19:CEO
Press Enter to continue... (user presses Enter here)
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Q - Quit
Your Selection: 5(user input)
Invalid selection
Press Enter to continue... (user presses Enter here)
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Page 6 of 10
Q – Quit
Your Selection: 2(user input)
Enter keyword: Sarah (user input)
95671660:Jones:Sarah:45:sales manager
99893878:Brown:Sarah:12:electrician
95437869:Anderson:Sarah:19:CEO
Press Enter to continue... (user presses Enter here)
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Q - Quit
Your Selection: 2 (user input)
Enter keyword: Monks (user input)
Monks not found
Press Enter to continue... (user presses Enter here)
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Q – Quit
Your Selection: 2(user input)
Enter keyword: (user simply presses Enter without typing in anything)
Keyword not entered
Press Enter to continue... (user presses Enter here)
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Q – Quit
Your Selection: 3(user input)
Add New Employee Record
Phone Number (xxxxxxxx): (user simply presses Enter without typing in anything)
Phone number not entered
Phone Number (xxxxxxxx): 00123456 (user input)
Invalid phone number
Phone Number (xxxxxxxx): 95437869 (user input)
Phone number exists
Phone Number (xxxxxxxx): 99887766 (user input)
Family Name: abc123 (user input)
Family name can contain only alphabetic characters and spaces
Page 7 of 10
Family Name: Warren (user input)
Given Name: Tony5 (user input)
Given name can contain only alphabetic characters and spaces
Given Name: Tony (user input)
Department Number: 123 (user input)
A valid department number contains 2 digits
Department Number: 23 (user input)
Job Title: accountant1 (user input)
Job title can contain only alphabetic characters and spaces
Job Title: accountant (user input)
Adding new employee record to the records file …
New record saved (display this only after saving record is successful)
Add another? (y)es or (n)o: n (user input)
(Note: if the user answer is y here then the above procedure is repeated)
Dominion Consulting Employees Info Main Menu
============================================
1 – Print All Current Records
2 - Search for Specific Record(s)
3 - Add New Records
4 – Delete Records
Q – Quit
Your Selection: 4(user input)
Delete Employee Record
Enter a phone number: 05671660 (user input)
Invalid phone number
Enter a phone number: 99999999 (user input)
Phone number not found
Enter a phone number: 95671660 (user input)
95671660:Jones:Sarah:45:sales manager
Confirm deletion: (y)es or (n)o: y (user input)
Record deleted. (This message is displayed only after this record has been successfully deleted
from the records file)
(If the user answer is n then the main menu is displayed again. Then if the user enters Q or q then the
script is terminated.)
(Continued next page)
Page 8 of 10
For All Your Scripts
You must
• Include your full name, student ID, and a brief introduction of what
the script does in all your shell scripts, as a comment in the beginning
of each script.
• Make your scripts run on the Bourne shell, regardless of which shell
the user of your scripts is currently on.
• Add in-line comments to help other people understand your scripts.
• Use “\n” where appropriate to make the output of your scripts more
readable.
• Note that your script structure and layout are also important as they
will be marked as part of the assessment process.
Submitting Your Assignment
You must submit a single folder named kit213a2 which contains the
following five (5) files, electronically to the kit213submit folder which has
been created for you in your alacritas account (do NOT create this
kit213submit folder yourself, see below for more details):
cp2.sh, mlog.sh, user.deny, menu.sh, records
(Please make sure that your kit213a2 folder only contains the five files as
listed here, when you are ready to submit them)
To submit your assignment, follow these three steps:
1). Ensure that both your kit213a2 folder and your kit213submit folder
are stored right under your home directory;
2). Run the following commands to copy your kit213a2 folder into your
kit213submit folder (the $ is the shell prompt):
$ cd (This takes you back to your home directory from anywhere)
$ cp -r kit213a2 kit213submit (This copies your assignment folder into your
kit213submit folder. The option -r is important)
$ ls -l kit213submit (This verifies that your assignment folder is now in your
kit213submit folder)
$ ls -l kit213submit/kit213a2 (This verifies that your assignment files are
now in your kit213submit folder)
3). Immediately use your mobile phone to make a screenshot of your secure
shell window (such as PuTTY window) and submit the image file to KIT213
MyLO (under Assessments, then Assignments), as proof of your assignment 2
submission. Use your name and ID number as the image file name, for
example, Smith_John_012345.jpg. If your assignment files are copied into
the kit213submit folder by the deadline, you do not receive any penalty if
this image file is slightly late.
Page 9 of 10
IMPORTANT NOTE: The kit213submit folder will be created for you
automatically close to the submission time – do not create it yourself as this
may cause your assignment to not be submitted correctly. If the
kit213submit folder does not exist, please advise the Unit Coordinator
immediately. Without a kit213submit folder, you will NOT be able to
submit your assignment 2.
If your assignment is late then you should submit your files to the
kit213late folder. The late folder will be created automatically after the
due date and will be available for one week only.
Need Help?
You are encouraged to seek assistance from your lecturer after you have seriously thought
about the assignment. Please note that we can provide general advice, however, we will not
help you write any code, nor will we help you debug.
(See next page for the assignment marking scheme)
Page 10 of 10
Appendix: KIT213 Assignment Two Marking Scheme
Script cp2.sh (for each item there are only 3 possible marks: 100% or 50% or 0%)
Mark Out of
Execution of the shell script
Script runs as expected (2). Script runs but not as expected (1). Script
does not run (0)
2
Check that dir1 and dir2 currently exist and that dir3 does not currently
exist.
2
Copy all files from dir1 into dir3 2
Copy new files from dir2 into dir3 2
Copy newer files from dir2 to dir3 and overwrite their namesakes 2
Script mlog.sh (for each item there are only 3 possible marks: 100% or 50% or 0%)
Mark Out of
Execution of the shell script
Script runs as expected (2). Script runs but not as expected (1). Script
does not run (0)
2
Check the existence of the file named user.deny 2
Correctly set up an infinite loop 2
Correctly display “No user on the user.deny list has multiple logins”
when this is the case
2
Correctly report the full names of the users (on the denial list) with
multiple logins
2
Script menu.sh (for each item there are only 3 possible marks: 100% or 50% or 0%)
Mark Out of
Execution of the shell script
Script runs as expected (2). Script runs but not as expected (1). Script
does not run (0)
2
Correctly set up a loop to repeatedly display the menu 2
Correctly display all records 2
Correctly search for specific records 2
Correctly add new records 2
Validate each field of a new record when adding new records 2
Correctly delete records 2
Others (for each item there are only 3 possible marks: 100% or 50% or 0%)
Mark Out of
Shell scripts structure and layout
Clear and tidy (4). Somewhat messy but understandable (2). Messy (0)
2
Include name, ID, and brief introduction in all scripts 2
Appropriate in-line comments 2
Assignment Total: /40

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