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EP476: Introduction to Scientific Computing for Engineering Physics

Homework #1

Due: Tuesday, February, 6, 1:00 PM

Most of these questions are based on a common directory structure found at ~wilsonp/ep476-hw1.

Prepare a standard text file with the answers to these questions, as appropriate. Send the text file to me by email.

  1. What is the command that will tell you the full path of this directory? What is that full path?

  2. Describe the contents of this subdirectory in a way that shows the hierarchy and indicates which are files, which are directories and which are symbolic links.

  3. Write a script with the commands that would accomplish the following in precisely this order:

    • make a new copy of the entire directory structure from its original location (~wilsonp/ep476-hw1) to the current directory, and in that new copy:
    • create an environment variable called NUCLEAR_DIR that refers to the absolute path of the top-level directory of this copy, i.e. the directory that was created by making the copy
    • Create an alias that will show you a long listing of the fission directory that you copied above.
    • change to the fusion directory
    • rename the tokamak.rst file to be tokamak.txt
    • make two directories: magnetic and inertial
    • move the tokamak.txt and stellarator.txt files to the magnetic directory
    • move the iec.txt and laser.txt files to the inertial directory
    • list the contents of the thermal subdirectory of the fission directory
    • create a symbolic link in your current directory (fusion) to the hybrid.txt file that is in the fission directory
    • Change the permissions of the directory referenced in NUCLEAR_DIR, and all of the directories and files below it, so that others can view it. You may also have to change the permissions of some directories above it to ensure that it is accessible. It is advisable to give the minimum possible permissions to the directories above this one. I will check these permissions by accessing the directory indicated by NUCLEAR_DIR above.
    • change your prompt to remove only the username and hostname portion

    Attach your script as a separate file to your email.

  4. Repeat question #2 with the new directory structure.

  5. In what ways does tab completion improve both accuracy and efficiency when working with the command-line?

  6. What did you learn about the command-line that might affect the way that you work?