Due by 11:59.59pm Friday October 22
We're going to start things off nice and simple. I'll recommend you create a cs241 directory in your CS account and a hw1 directory inside that.
First off, go to https://classroom.github.com/a/9i9oVJE_ and create a repository in the CS 241 organization.
Click on the link and head towards the created repository. It will be called hw1-username
Go back to your CS account to the cs241 directory above, and clone the repository into this account. Refer to the github tutorials for how to do this step.
To work with a partner, follow these steps:
Everyone is going to be expected to turn in a submission. It makes no sense to work on two separate repositories, however. For this assignment, one person will add the other as a collaborator and you will both do the assignment on that repository. For the other repository, just commit a README file with the name of your group (optional) and your partner.
For this assignment you will be creating a number of shell scripts.
Write a shell script called testurl.sh that accepts a list of urls in a separate file and tests if the website is up or not. You might find it useful to checkout the curl, wget and tail commands.
rhoyle@clyde$ cat urls http://cs.oberlin.edu/~ncare/cs241/labs/lab8.html https://occs.cs.oberlin.edu/~rhoyle/17s-cs241/assignments/hw02.html http://no.such.url http://occs.cs.oberlin.edu rhoyle@clyde$ ./testurl.sh urls Not found: http://no.such.url
This script should also handle errors. If the user doesn't provide any urls to the script it should print out a usage message.
Next, I want you to create a script called backup.sh. The script should take as arguments a directory to backup into followed by a list of one or more files to copy to the backup directory.
Your script should only copy files in if their timestamp is more recent than the file that exists in the backup directory when the script is run. You might find it helpful to check bash's test (i.e. [ ]) syntax. Additionally, you should make your script executable using chmod. That is, the command should be runnable as follows
Create a shell script called diskhog.sh that lists the 5 largest items (files or directories) in the current directory in decreasing order of size. You should output the sizes in a human readable format like so:
% cd ~rhoyle/pub/cs241 % ./diskhog.sh 3.9M week03 572K old 348K hw06 152K week06 112K week05
Check out the man pages for du, cut, sort, xargs and head (or tail)
If the script is run from an empty directory, make sure it prints nothing at all (and not an error message)Create a shell script called linecount that by default will report the total number of lines in all of the files in the current working directory (recursively).
You'll want to take a look at wc, cd, find, and test.
I often find myself using shell tools to answer questions about a data file that I'm working on. The file that we will work on can be downloaded from https://coronavirus.ohio.gov/static/dashboards/COVIDSummaryData.csv. You should use wget or curl to download it.
Answer the following questions in your README file (and give the commands used to find the answer):
Potentially useful commands to look at include cut, sort, and uniq. If you include the commands you used to generate your answers, it might be possible to give you partial credit. Include the downloaded data file with your submission as the file will change over time.
These are ideas for extra credit. You do not need to implement them all. You can also come up with your own ideas, just ask me if they would count for extra credit if you have doubts.
% ./linecount '*.java'
Create a file called README that contains
Now you should clean up your folder (remove test case detritus, etc.) and handin your folder containing your scripts and README.
Here is what I am looking for in this assignment: