CSCI 3215 (Advanced UNIX Command-Line Tools), Fall 2022:
Homework 2
- Credit:
- 20 points.
Be sure you have read, or at least skimmed,
the assigned readings for 10/03.
Do the following programming (shell-scripting) problems.
You will end up with at
least one shell script per problem.
Submit your program source (and any other needed files)
by putting them in your course “TurnIn” folder on
Google Drive.
(Note that I want plain-text files, with or without an extension of .sh.
If Google Drive balks at that, rename to have an extension of .txt.
I want something I can run as is, except for possibly a change of filename.
So no screenshots!)
You can develop your scripts on any system that provides the
needed functionality, but I will test them on one of the department's
Linux machines, so you should probably make sure they work
in that environment before turning them in.
- (10 points)
Do one of the following:
- Write a shell script that renames a file
(specified as a parameter),
changing any blanks in its name to underscores.
If no filename is given, or if the file does not exist,
the script should print an error message.
Probably it should also print a message if the old and
new names would be the same.
Hint: See the examples in the class notes
and the example scripts on the
sample programs page.
- Write a shell script that makes use of a conditional
(if/then/else/fi) and at least one positional
parameter and does something you find useful or interesting.
Include comments at the top of the script describing its
purpose.
- (10 points)
Do one of the following:
- Write a shell script that searches all directories in
your search path for a specified file/executable and prints
the directories where it is found.
For example, if the script is called find-in-path,
find-in-path ls would print /bin and /usr/bin or
/bin/ls and /usr/bin/ls.
If the specified file is found in more than one directory,
the script should print them all.
If it is not found at all,
the script can print an error message or just do nothing.
If no file/executable is specified,
the script should print an error message.
Hint: See the examples in the class notes
and the example scripts on the
sample programs page.
- Write a shell script that makes use of a loop
(for or while)
and does something you find useful or interesting.
Include comments at the top of the script describing its
purpose.
This should include the Honor Code pledge, or just the word “pledged”,
plus at least one of the following about
collaboration and help (as many as apply).
Text in italics is explanatory or something for you to
fill in;
you don't need to repeat it!
- I did not get outside help aside from course
materials, including starter code,
readings, sample programs, the instructor.
- I worked with names of other students on this
assignment.
- I got help with this assignment from
source of help -- ACM
tutoring, another student in the course, etc.
(Here, “help” means significant help,
beyond a little assistance with tools or compiler errors.)
- I got help from outside source --
a book other than the textbook (give title and author),
a Web site (give its URL), etc..
(Here too, you only need to mention significant help --
you don't need to tell me that you
looked up an error message on the Web, but if you found
an algorithm or a code sketch, tell me about that.)
- I provided help to names of students on this
assignment.
(And here too, you only need to tell me about
significant help.)
This should be a brief essay
(a sentence or two is fine, though you can write as much as you like)
telling me what if anything you think
you learned from the assignment,
and what if anything you found
interesting, difficult, or otherwise noteworthy.
2022-10-23