Shell 2 - Pipes and Filters

You’re working on a large project trying to predict diversity hotspots. Another member of your collaborative team has produced a series of files that contain lists of areas that resulted from a series of modeling exercises. Each filename begins with the word area.

Your programmer has whipped up a small python script called that takes a single file containing a list of areas, one per line, and returns the area and the predicted richness based on the functions and approach given in the Higher Order Functions 2 problem.

Your team is, of course, using version control and all of the relevant files are in the repository. Navigate to the main working directory for your repository and update it from the command line using svn update. This will place the necessary files in your main directory. Move the files into the directory you created for this assignment by either using svn move filename new_locationor by right clicking on the file in SmartSVN and selecting Move.

Your job is to take all of these files, run them through the python code and produce a single list of the areas and associated richness predictions from all of the sites combined. This list should be sorted from the smallest area to the largest area, should only include unique values, and should be stored to a file called predicted_diversities.txt. You could cut and paste the files together, run them through the Python code, and then do some post processing to get the list looking right, but new files are going to be showing up constantly, and besides, this can be readily accomplished in one line using the shell. Once you’ve figured out the necessary shell commands put them in a text file and save it as Test to make sure everything is working by running it using the command bash Commit the new shell program and the resulting data file to the repository.

Email me when you are done with this problem so that I can update your repository for Problem 3.

Optional: Modify your own code from the Higher Order Functions 2 problem to create your own version of instead of using the one in the repository. One easy way to deal with stdin is to use fileinput.input(). Move the equations back into the body of the code so that it’s just a single self-contained unit. Overwrite the version of from the repository and commit the new version.