Set up the script and create an input file

First, create a Bash shell script that contains the following commands. Name it mod$9.$sh$.$

You can copy$-$and$-$paste this code if you want to$.$ Lines that begin with the # symbol are comment lines; it's your choice whether you want to include them inside your script file.

#$!/$bin$/$bash

# Get command$-$line arguments

in$\_$file$=$$$1$

out$\_$file$=$$$2$

# Get the first $80$ characters of the input file and place

# them into the output file $($note: this is the same $"$dd$"$

# command from pages $98-99$ of Linux Basics for Hackers$)$

dd if$=$$in$\_$file of$=$$out$\_$file count$=1$ bs$=80$

# Append an end$-$of$-$line character to the output file

# $($note: you need $>>,$ not just $>,$ in this case!

# $>$ would clear the output file's old contents.$)$

echo $\text{'}$

$\text{'}>>$ $out$\_$file

# Send the contents of the output file to standard output

cat $out$\_$file $>/$dev$/$stdout

# Send a confirmation message to standard error

echo 'Output file has been created.$\text{'}>/$dev$/$stderr

exit $0$ # this last line isn't required, but it's good practice

Once this script is created, make it executable $($chmod u$+$x mod$9.$sh is a good command for this$).$

Next, run the following command to create a text file that is exactly $80$ characters long.

echo 'This is a text file that happens to be exactly $80$ characters long. Use it well.$\text{'}>./80$char.txt

Create a file containing your results

Now start a new LibreOffice Write $($or Word$)$ document, or open a new text file. $($The file name does not matter.$)$ This is the only file that you need to submit on Canvas.

In the file, write what you see when you run this script with each of the following commands. You can copy output from the console into your file, or you can write English text to summarize what you can see; it's your choice.

$./$mod$9.$sh $./80$char.txt $./9-1.$out

$./$mod$9.$sh $./80$char.txt $./9-2.$out $>/$dev$/$null

$./$mod$9.$sh $./80$char.txt $./9-3.$out $2>/$dev$/$null

$./$mod$9.$sh $/$dev$/$zero $./9-4.$out

$./$mod$9.$sh $/$dev$/$random $./9-5.$out

if this command stalls or stops working, press Ctrl$+$C or Command$+$C on your keyboard to stop the command

$./$mod$9.$sh $/$dev$/$urandom $./9-6.$out

Also, answer the following two questions in your output file.

Did anything about the output from any of these commands surprise you? If so$,$ what?

Is there anything about the script or these devices that you are confused about or that you would like to learn more about? $("$No$"$ is an acceptable answer.$)$