Dates

The midterm will be available all day on Wednesday, March 26. You will have 1 hour to complete it from the time you start. The proceure for the real midterm will be identical to the one used to obtain and submit the practice. The only difference will be the repository names.

Practice

There are two practice midterm repositories available to you, midterm/practice1 and midterm/practice2.

• Fork the midterm

  $ ssh git@ece2524.ece.vt.edu fork midterm/practice1 cvl_username/midterm/practice1

  The digit 1 in the destination cvl_username/midterm/practice1 could be any digit between 1-9. You can take advantage of this fact to take the practice midterm more than once.

• Clone a local copy

  $ git clone git@ece2524.ece.vt.edu:cvl_username/midterm/practice1.git ~/ece2524/practice_midterm1

  Note, you can change the destination ‘~/ece2524/practice_midterm1` to be anything you like, in particular, you can fork and clone either practice exam any number of times putting each into a different destination directory to practice the procedure.

• Change directory and view README

  $ cd ~/ece2524/practice_midterm1
  $ less README.md

Solutions

I have made solutions to the two practice midterms available at repos named solutions/midterm/practice1 and solutions/midterm/practice2, respectively. To view the solutions, clone the repo, e.g.

$ git clone git@ece2524.ece.vt.edu:solutions/midterm/practice1 ~/ece2524/solutions/practice1

change directory to the one created by the clone

$ cd ~/ece2524/solutions/practice1

and view the README.md for the solutions to the command-related questions and the relevent source files for the programming solutions.

In both solution repositories I have included a file named part1.transcript which contains the commands I ran for the “Files and File System” section.

To compile the programing solutions change directory in into the appropriate sub directory (yawc for practice1 and mailgrep for practice2) and run the make command

$ cd yawc
$ make

You should then have a compiled binary named either yawc or mailgrep depending on which solution you compiled. To exercise the program there are some sample input files in the files directory of the repo. Assuming your current working directory is the one containing the source files and the compiled binary, try the following test cases

$ ./mailgrep ../files/*.txt
$ ./mailgrep ../files/file1.txt not_a_file ../files/file2.txt
$ cat ../files/*.txt | ./mailgrep

or

$ ./yawc ../files/*.txt
$ ./yawc ../files/afile.txt not_a_file ../files/some_file.txt
$ cat ../files/*.txt | ./yawc

Note: As I mentioned in class, both these programs ask you to read open command line arguments as file names. We haven’t talked about this yet in class, for the midterm I will only expect you to be able to read from standard input, so both the practice programs are a bit more complex then anything that will be on the midterm this semester.