Lab 10

Part I

In this part of the assignment, you will practice finding text. You should utilize grep in every command.

Begin, by creating an ssh connection to scratch.cs.dixie.edu. Create a directory in your home directory called lab10. All the files you create below should be placed into this directory.

• Using the dmesg command find all the lines that have USB in them. Copy the whole command into a file called grep1.txt
• Using the ifconfig command find only the line that has the inet address for the Ethernet connection (IP of the machine). Copy your command to a file called grep2.txt. (So you might also grep for 144 or the full ip of your machine)
• Search for the word sshd in the /etc/passwd file. Copy your command to grep3.txt.
• Find only the first 2 instances of able in the /usr/share/dict/words file. The command should only find 2 instances.
  • Either use a pipe to the view command that allows you to limit the number of results.
  • Or use the man page for grep to figure out which option allows you to limit the number of results.
  • Copy your command to grep4.txt.
• Using a single command find every occurance of the whole word root inside any file in the /etc/ directory and output the line count of how many results you get. In the search we only want to include the whole word root not variants like chroot. Don’t forget to redirect errors.
  • Use the man page to find out how to search inside a directory with grep
  • You will also need a pipe and redirect to take the count
  • HINT: there are two ways to do this. The first is the grep command with a recursive option searching for a whole word. The second method uses the find command piped to xargs and grep, using the whole word option. Either way is acceptable.
  • Copy your command to grep5.txt.

Part II

In this part of the assignment, you will practice finding files.

Begin, by creating an ssh connection to scratch. You should utilize commands such as find, which to complete the following tasks (use the man pages if you need to). If you are prompted to find all files on the system you should pass the -mount flag to the find command so that it will only search the local filesystem. For each of the tasks below, after you have found the correct command, copy the command to the appropriately named file in your lab10 directory.

• Find all directories and only the directories in /etc/. Save the command in find1.txt.
• Figure out where the executable apache2ctl is located. Save the command in find2.txt. Your command should return a single path to where this is located.
• Find only the files somewhere in the /usr directory named broken.png. Save the command in find3.txt.
• Find all files within the /tmp directory that have been text modified within the last 5 days. Save the command in find4.txt.
• Find a count of all .png files that are in /usr/share/apache2. Save the command in find5.txt.
• Figure out where the executable ifconfig is located. Save the command in find6.txt. Your command should return a single path to where this is located.

To Pass Off

The grading script will be run as you are logged into scratch. The command you will execute will be similar for all of your assignments that have an autograder. Here is a sample of the command you will run: run_grader.py --n 2. The 2 is representative of lab2. (Lab 3 would replace the 2 with a 3). You will see some feedback. You should make sure that all your tests pass and that your score is correctly recorded. Please see your instructor for any help or questi ons on the output.