Linux Assignment 4 Summer 2017 CHECK YOUR WORK! You should immediately save this document as ..4.txt. You should answer all of the questions for this assignment by typing the answers in the spaces provided below the question. You will start off with a 75 should you NOT follow these directions. Below are questions related to the command line use of Linux. You can use the videos, man pages, and notes to answer these questions. Note that I will know if you 'google' for your answers as students who do this will do well on the assignments, and poorly on exams. CHECK YOUR WORK! Remember that Linux is 'case sensitive.' Rm and rm are NOT the same command. I will count off totally for a question if you do not take this into account. For each command give me the ENTIRE COMMAND SEQUENCE. If I ask you 'What command would I use to move the file one.txt to the parent directory and rename it to two.txt?', the answer is NOT 'mv.' That's only part of the command. I want the entire command sequence. CHECK YOUR WORK! **** All of these questions can be answered by viewing the videos, notes, and the man pages. You will do well if you have worked in Mint (or Ubuntu) and copied the commands I have run while watching the videos ********* CHECK YOUR WORK! I suggest you CHECK each command to make sure it works before submitting your assignments. If you need to create some files so you can try some of these commands, use 'touch '. If you need to put some content in a file so you can search contents, you can use 'gedit' (the graphical text editor), or use what I use in class: echo "some text here" > name.of.file. CHECK YOUR WORK! Cheating will be dealt with severely. There are a maximum of 100 points. 1. Create a symbolic link called ~/Desktop/food.doc that links to ~/Documents/bard.txt. (5 pts) 2. Create a command that will run the file /etc/runme.sh at 5AM using the 'at' command. (5 pts) 3. I just ran a command that will run longer than I expected and I want to stop it. The PID of the process is 1234. What command could I run to stop the process? (5 pts) 4. Create a command that will create an MD5 hash of all the files in the /usr/bin directory, and save it to a file called ~/Documents/executables.md5. (You did watch the videos, right?) CHECK YOUR COMMAND! (5 pts) 5. Create a command that does a long, recursive directory listing of all files under /var/log making sure to ignore standard error. CHECK YOUR COMMAND! (5 pts) 6. I have two servers (A & B) running Linux. Both are running OpenSSH. I'm logged into A as user 'Fred.' I have an account on B called 'Ethel.' I want to use scp to copy the file 'fred.doc' from A (IP = 10.10.10.1) to B (IP = 10.10.10.2) to the directory /home/Fred/Desktop. What command would I use? (5 points) 7. Run the command that updates your date using an ntp server from Ubuntu. (5 pts) 8. What is the command to set your system date to Nov 8, 2014 10:00PM? (5 pts) 9. What command would I run if I want to archive and compress all of the documents in ~/Desktop/backups/2015 to a file called '~/backups.bz2'? Remember you are in ~. (5 pts) 10. Below, create a simple shell script (something I could copy directly from your assignment into a text file and run) that would delete all files with the name "Fred.*" under /var/log whose whose size is less than 1MB. (5 pts) 11. I just created the following shell script in the file "runme.sh": #!/bin/sh find / -type f -name *.tmp -size +10k -size -20k -exec rm {} \; I save the file, and then attempt to run it. received the error bash: ./runme.sh: Permission denied. Show me the command that solves the problem. (5 pts) 12. Create a command that will search for files under /etc that contain the keyword "PAM", and return a COUNT of the number of files. That's all I want to see, a number. (User the man pages: 5 pts) 13. Create a command that will identify files under /usr/sbin that are greater than 1 kilobyte and less than 1MB. (5 pts) 14. Create a command that will run the script runme.sh one hour from now. (5 pts) 15. I've run 24 commands in the background from a terminal. Some of these I know will take some time to complete. How would I find out what commands have not completed yet? (5 pts) 16. What command could I run to determine whether the ssh daemon is listening? (There are a couple of correct answers here.) How would you check this? Hopefully you've installed OpenSSH (shown in the videos). Then identify the command, it should show that ssh/port 22 as "listening.' (5 pts) 17. I have a directory called "~/MyFiles." It's owned by user 'pc' and group 'pc.' Change the ownership so that it is now owned user 'super' and group "secret". (5 points) 18. Create a crontab entry that would run the file /etc/clear.sh every day at 3AM. 19. Create a crontab entry that would run the file /etc/clear.sh every Wednesday at 5:01PM. 20. Create a command that will find all files under / that end in the extension *.txt, and whose contents contain either the word "new" or "old" or "borrowed" or "blue". (Look at egrep, watch the video!). CHECK YOUR WORK! (5 points).