Chapter 12 Lab included in study material ???

I've experienced a couple times where the Lab Exercise sent us astray from the actual material being studied. I figure this is intentional forcing the student to venture out into man/info/help pages to seek the answer. That's great and it's very helpful.
BUT, in chapter 12 Lab Exercise we're asked to perform actions using the dd command (never mentioned at all) and then perform a couple tasks that circle back to using the "kill command" and "jobs" command.
Is there a relevance that I'm missing to this exercise?
Did I just flat-out miss the boat in the study material somewhere?
Is this what the actual test labs will do during the certification process?
I was able to get through it although the outputs did not work as described in the solution. That's causing me to go outside the course to learn the Linux "dd" command in detail so I can better understand its usage and hopefully draw some relevance to chapter 12.
Just wondering if anyone who's already passed this portion can shed some learning light on this.
Any and all help will be greatly appreciated.
Doug
Comments
-
Hi @douglukas
BUT, in chapter 12 Lab Exercise we're asked to perform actions using the dd command
(never mentioned at all) and then perform a couple tasks that circle back to using the "kill command" and "jobs" command.>
Is there a relevance that I'm missing to this exercise?
Of course it's relevant, because Chapter 12 is about Process Monitoring; we are using "dd" in this lab to read from one place (/dev/urandom) and write to another place (/dev/null). So that process should continue until you kill it. We also are asked to change the state of the process.
Perhaps what made you confused was that you didn't know the "dd" command, so you lost the picture. But this is a very well known tool and it's pretty good you are learning how to use it. In the linux and open source world learning some things by ourself is part of the culture, so even if we try to provide the most of things we can, there are also some other stuff you need to investigate by yourself, because that will happen soon or later.
If anything is not working for you, feel fee to ask. For that, please provide your distro name and version, kernel version, the command you are running and the error you are getting.
Many regards,
Luis.0 -
What wasn't working according to the solutions was the
$ fg
$ ^Z
$ ps -C dd -o pid,cmd,statAfter the $fg command it moves to a blinking running process cursor, so I'm unclear on how/when to invoke the $^Z command.
Without any previous direction on this action, I'm left to just experiment and try to research it.
Bottom line is that I've yet to be able to complete the solution as defined no matter what I try.
0 -
You are trying without the dollar symbol, right?
If possible, provide a screenshot with the commands and the outputs, starting from item 1 (dd if=/dev/urandom of=/dev/null &).
Please also provide the distro you are working with and version.
Regards,
Luis.0 -
Ubuntu 18.04
Tried it a couple different ways but each time after the "fg" and "^Z" commands I had to Ctl-C to exit out of it. Images attached of my path and outputs.
Thanks,0 -
I"m not sure what the problem is. You should not be hitting Ctl-C before doing th eps command. The steps in the solution work perfectly for me. The whole point is that CTL-Z suspends the process but it still shows up with ps. After you do a fg and then CTL- C it is gone. So something is missing in how you are seeing this. As best I can see the material in the lab and the solution works perfectly. Please let me know if I am begin blind about something
On the question of dd, as Luis says, it is a very basic tool used every day, such as ls, or cp, cat, echo etc, and it is covered in LFS101x which is a prerequisite of this course, or anything equivalent. We also don't teach in LFS201 other basic tools like vi, nano, gedit, emacs, etc.
1 -
So after initiating the fg command does the process take time or should it be quick. I'm waiting about 30 seconds before I give up. Should I be waiting longer to finish the command?
0 -
I got it now! So in the solution from the lab the 2nd line (see image below) shows what I thought was a ^Z (shift-6 symbol). NO, dumb me didn't realize that you're are to invoke a CTL-Z after initiating the fg command.
The CTL-Z gets you out of the fg command. Problem with the Lab info is that when they placed the $ ^Z, you get the impression that the fg command initiates and completes. It does not. That's why you have to type CTL-Z after invoking "fg" command (see below)NOTE: in the image above, there is no $ in front of the CTL-Z (^Z). I was actually trying to type the CARAT symbol (Shift-6) after the fg command. Also note that there is an output of [1]+ Stopped ...... that follows my CTL-Z input. This isn't shown in the solution above. Perhaps my Ubuntu 18.04 distro has something to do with this.
All good now that my brain dead moment and a bit of confusing lab text is over.
0 -
Hi @douglukas ,
Many things can be confused when they are unknown to us. I don't think the lab is confusing itself, perhaps it was a bit difficult to understand it. I'm glad that you were able to get it.
Regards,
Luis.0
Categories
- All Categories
- 51 LFX Mentorship
- 104 LFX Mentorship: Linux Kernel
- 576 Linux Foundation IT Professional Programs
- 304 Cloud Engineer IT Professional Program
- 125 Advanced Cloud Engineer IT Professional Program
- 53 DevOps Engineer IT Professional Program
- 61 Cloud Native Developer IT Professional Program
- 5 Express Training Courses
- 5 Express Courses - Discussion Forum
- 2K Training Courses
- 19 LFC110 Class Forum
- 7 LFC131 Class Forum
- 27 LFD102 Class Forum
- 157 LFD103 Class Forum
- 20 LFD121 Class Forum
- 1 LFD137 Class Forum
- 61 LFD201 Class Forum
- 1 LFD210 Class Forum
- LFD210-CN Class Forum
- 1 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum
- LFD237 Class Forum
- 23 LFD254 Class Forum
- 611 LFD259 Class Forum
- 105 LFD272 Class Forum
- 1 LFD272-JP クラス フォーラム
- 1 LFD273 Class Forum
- 2 LFS145 Class Forum
- 24 LFS200 Class Forum
- 739 LFS201 Class Forum
- 1 LFS201-JP クラス フォーラム
- 11 LFS203 Class Forum
- 75 LFS207 Class Forum
- 300 LFS211 Class Forum
- 54 LFS216 Class Forum
- 47 LFS241 Class Forum
- 41 LFS242 Class Forum
- 37 LFS243 Class Forum
- 11 LFS244 Class Forum
- 36 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 140 LFS253 Class Forum
- LFS254 Class Forum
- 1.1K LFS258 Class Forum
- 10 LFS258-JP クラス フォーラム
- 93 LFS260 Class Forum
- 132 LFS261 Class Forum
- 33 LFS262 Class Forum
- 80 LFS263 Class Forum
- 15 LFS264 Class Forum
- 11 LFS266 Class Forum
- 18 LFS267 Class Forum
- 17 LFS268 Class Forum
- 23 LFS269 Class Forum
- 203 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- LFS281 Class Forum
- 235 LFW211 Class Forum
- 172 LFW212 Class Forum
- 7 SKF100 Class Forum
- SKF200 Class Forum
- 902 Hardware
- 219 Drivers
- 74 I/O Devices
- 44 Monitors
- 115 Multimedia
- 209 Networking
- 101 Printers & Scanners
- 85 Storage
- 763 Linux Distributions
- 88 Debian
- 66 Fedora
- 15 Linux Mint
- 13 Mageia
- 24 openSUSE
- 142 Red Hat Enterprise
- 33 Slackware
- 13 SUSE Enterprise
- 357 Ubuntu
- 479 Linux System Administration
- 41 Cloud Computing
- 70 Command Line/Scripting
- Github systems admin projects
- 95 Linux Security
- 78 Network Management
- 108 System Management
- 49 Web Management
- 68 Mobile Computing
- 23 Android
- 30 Development
- 1.2K New to Linux
- 1.1K Getting Started with Linux
- 537 Off Topic
- 131 Introductions
- 217 Small Talk
- 21 Study Material
- 826 Programming and Development
- 278 Kernel Development
- 514 Software Development
- 928 Software
- 260 Applications
- 184 Command Line
- 3 Compiling/Installing
- 76 Games
- 316 Installation
- 62 All In Program
- 62 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)