Extra Credit #1

Due: May 30, 2025
Points: 100

The goal of this extra credit is to encourage you to try different things on Linux to become familiar with that system. This will prove useful to you in other classes.

1. (10 points) The Linux manual has 8 sections. When you see “man(1)”, that means the manual page for the command man is in section 1 of the manual. To see what each section of the manual contains, look at the intro manual page in each section.
   1. What command would you give to print the manual page for the system call creat in section 2 of the manual?
   2. Please write a one-line description of what each section of the manual contains; for example,
      Section 1: user commands
      Section 2: system calls

2. (10 points) What command(s) would you use to copy the file /home/bishop/hw1-programs/vis-output to your home directory and make it read-only by everyone (owner, group, world).

3. (10 points) What command would you use to create a subdirectory called test in your home directory. With what access permissions is it created?

4. (10 points) Write a command to print only the last line of the file /etc/passwd.

5. (10 points) Show the command to make a copy of the directory /usr/bishop/hw1-programs, and everything it contains, in your home directory, with one command. Hint: Look at the -r option to the copy command cp(1).

6. (10 points) When I write data into the file /dev/null, what happens to it?

7. (10 points) The program ls(1) lists the contents of a directory. But it does not list any files whose names begin with “.” (period). What option would I give to ls to include those files in the output?

8. (10 points) Every directory contains a subdirectory named .. (that is, dot-dot). What is that subdirectory? And what is the .. in the root directory /?

9. (10 points) The file /usr/share/dict/words contains a list of English words. Write a command that will print all words in that file that contain the character sequence “gry” in the file GRY.

10. (10 points) How would I list all files in the current working directory that begin with “a” and end with “.txt"?

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: mabishop@ucdavis.edu

ECS 36A, Programming and Problem Solving Version of May 20, 2025 at 3:01PM

You can also obtain a PDF version of this.