Homework 3- Shell Scripting
This
homework is due Monday, 13 March 2000.
This
is a 40 point homework. Point values
for each question are indicated in parentheses after the question. There are
more points possible than the 40 I will grade. Here’s how things break down:
·
There are four questions, worth 20, 15, 10 and 5 points each
(total of 50 points).
·
A question will be given full credit if it does what it’s
supposed to do, even if it doesn’t detect errors or make the output look
“pretty.”
·
Each of the four questions has a possible extra credit of 1% on your final grade
if you do “full” error checking in addition to solving the problem.
·
If you answer all
four questions correctly, you will be given an extra credit of 1% on your final grade.
Good
luck!
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1. Write a script
called trash that acts
like the Microsoft Windows Recycle
Bin by moving a file to the “Trash Bin.” When called with a file as an argument
it should move that file to the directory $HOME/.trash instead of
actually deleting it. You may need to create the $HOME/.trash directory
before running the script (or as part of the extra credit handle the
possibility that the directory doesn’t exist when trash is
called). (20 points)
2. Write a
supplemental script to trash called digtrash that will
show the contents of the “Trash Bin.” When called without a file as an
argument it should list all the files in the directory $HOME/.trash. When called with
a file as an argument it should report whether or not that file is in the
directory $HOME/.trash. If the argument file is in the
directory $HOME/.trash, the script should list the file as it
exists in the $HOME/.trash directory. (10 points)
3. Write another
supplemental script to trash called pulltrash that will
‘undelete’ a file from the “Trash Bin.” When called with a file as an argument
it should move that file from the directory $HOME/.trash to the
current directory. (15 points)
4. Write a final
supplemental script to trash called emptytrash that will
remove all files from the “Trash Bin.” When called it should remove all files
in the $HOME/.trash
directory. (5 points)