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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Educational
Introduction to Linux
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Joined: 13 Nov 2013
Posts: 1658
Location: Canada

PostPosted: Sun 16 Apr 2017, 15:51    Post subject:  Introduction to Linux
Subject description: 100% online and self-paced & free via edx.org

Why use Linux? Actually, it is easier to use than Windows.




Audience :
This class is designed for people who have little or no prior experience with Linux or Unix. System administrators, developers, architects, decision makers or new Linux users can all benefit from the content covered in this class, especially if they are looking to work with more involved topics such as Linux system administration, network management and enterprise system architecture.

100% online and self-paced
40-50 hours of content designed by our Linux experts
Designed to give students a good working knowledge of Linux
Absolutely free via edx.org

Further reading :
Linux Copy (cp) File Command Help and Examples

If you want to have information (version, repository it comes from) about applications installed on your system, you can do this :
apt-cache policy package name

johnny@debian:~$ apt-cache policy x11-common
Installé : 1:7.7+19
Candidat : 1:7.7+19
Table de version :
*** 1:7.7+19 500
500 http://ftp.ca.debian.org/debian buster/main i386 Packages
100 /var/lib/dpkg/status

How to run a checkdisk : https://askubuntu.com/questions/59064/how-to-run-a-checkdisk
How to mount USB drive in Linux : https://linuxconfig.org/howto-mount-usb-drive-in-linux & https://help.ubuntu.com/community/Mount/USB
Connect To Wifi From The Linux Command Line :
Installing Wine : http://www.linuxandubuntu.com/home/how-to-install-wine-and-run-windows-apps-in-linux
How to configure your wireless network :

How to disable swap when programs lock up, the desktop becomes unresponsive or things just slow down.
You used up quite a lot of RAM and, after the task was completed, your Linux desktop was still slow for a while afterward? When you perform tasks that fill up your computer's memory, such as opening a lot of web browser tabs, compiling large software projects or running a virtual machine, your operating system punts information it is not using right at that moment from memory into swap space. This is quite handy as it means your applications can continue to stay open while just using up space on your disk, not in precious RAM.

The downside to this scenario is when your memory intensive task is complete and RAM is once again available, the operating system doesn't know if it should pull data from slow disk space, back into RAM. Maybe you want that memory for something else. Linux does not know if it should move data from swap back into memory until you try to use one of your already open applications. When you start clicking on open applications, the system needs to pause and pull that application's data back in from swap and this makes the application respond slowly.

To get around having our applications lock up or stutter after they have been exiled to swap space, we can force Linux to flush swap, reloading all data back into RAM all at once. This takes a few seconds, but means no waiting for our already open applications to respond when we want to use them again. Flushing swap is pretty easy to do and just requires that we temporarily disable swap. With swap disabled, data is loaded back into memory automatically to prevent losing information. We can flush and disable swap with the swapoff command, run as the administrator :

swapoff --all
swapon --all
swapon --show

Source : Quick tricks to fix small problems on Linux

sudo fix :

How to Install and Use TeamViewer on Linux [Complete Guide]

Thunderbird and missing profile :
Okay, so I found what was going on.. .cache directory in my home directory was corrupted so I deleted it and voila.. all is going as it should
I looked for a solution for missing profile when using Thunderbird as root, and found this very simple solution.
Source : https://bbs.archlinux.org/viewtopic.php?id=207015
Linux from scratch (Arch) :
Removing resolv.conf symlink and creating resolv.conf file to help change DNS :
If you want to update /etc/resolv.conf manually, you can remove the symlink and create /etc/resolv.conf by hand. This way, the file won't get updated from resolvconf ever.
$ rm /etc/resolv.conf ;# to remove the symlink
$ vi /etc/resolv.conf ;# to create a regular file
How to Easily Boost Ubuntu 16.04/17.10 Network P
erformance by Enabling TCP BBR
How to View Contents of Compressed (.zip, .gz , .tgz, .tbz2, .7z) Files and Folders in Linux
How to add flathub :
You have to have flatpak installed, then do :
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
Try installing an app, such as gradio :
sudo flatpak install flathub de.haeckerfelix.gradio
How to Install and Use Snap
User & Group management : Complete Beginner’s Guide
6 Online Tools for Generating and Testing Cron Jobs for Linux
How to Configure sources.list on Debian 9
Install NTP server on Linux machines
How to Install Specific Version of Package
How to Exclude Specific Package from apt-get Upgrade
Useful FFMPEG Commands
Linux Shutdown Command Example
The APT tools
How to fix broken packages
How to Enable or Disable Services in Ubuntu Systemd/Upstart
How To Schedule Shut Down On Linux
flatpak on gnu/linux for complete newbie part 1
Fix out of sync system time
Fix GPG signature verification error
flatpak on gnu/linux for complete newbie part 2
Creating Symlinks – How and Why
Using ‘Alias’ in Linux
Debian modprobe Tutorial
What is ZFS?
backup tools
Uncomplicated Firewall
Automatic Unattended Security Updates
Flush DNS Cache on Ubuntu
How To Set Up A Software RAID On Linux
Learn How to Get Linux IP Address in Different Ways
The Best Linux Lockscreen
How to change the display manager on Linux
Beginner’s reference guide to NMAP command
ethtool Commands and Examples
Create and Add Swap File Tutorial
For fallocate section, it is swapfile-1 from start to finish; author drops the -1 during tutorial, an error.
How to Use Ubuntu Snap Packages
Beginner’s guide to SELinux
How to configure SELinux on Ubuntu
Recovering from Corrupted Packages in Debian
How To Fix Broken Packages In Ubuntu via Terminal
How to Easily Remove Packages Installed From Source in Linux
How to install a device driver on Linux
How to create a basic LVM volume on Linux
Use Zswap to Improve Performance on Linux PC with Low Amounts of RAM
Timeshift – Reliable system restore tool for Linux
5 Ways To Check Laptop Battery Status And Level From Linux Terminal
How To Change The Default Display Manager (Switch To GDM, LightDM, SDDM, Or LXDM)
Debian Package Dependencies
Text to Speech on GNU/Linux Part 1: Type to Speak
Text to Speech on GNU/Linux Part 2: Okular to Speech
Text to Speech on GNU/Linux Part 3: Orca on KDE
How to check if your processor supports Virtualization Technology
Set Alarm to Automatically Power On Linux Computer
System Info / Hardware Details in Command Line : inxi
How to install Java on Linux
How To Show A History Of Installed, Upgraded Or Removed Packages In Debian, Ubuntu
Different Ways To Update Linux Kernel For Ubuntu
How to Set JAVA_HOME Path in Ubuntu 18.04 LTS

Last edited by labbe5 on Sat 09 Feb 2019, 17:37; edited 68 times in total
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Joined: 13 Nov 2013
Posts: 1658
Location: Canada

PostPosted: Thu 09 Nov 2017, 11:05    Post subject: wireless speed management  

Application: iwconfig

The speed at which a piece of radio transmission/receiver equipment can communicate with another depends on how much signal is available. In order to maintain communications as the available signal fades, the radios need to transmit data at a slower rate. Normally, the radios attempt to work out the available signal on their own and automatically select the fastest possible speed.

In fringe areas with a barely adequate signal, packets may be needlessly lost while the radios continually renegotiate the link speed. If you can't add more antenna gain, or reposition your equipment to achieve a better enough signal, consider forcing your card to sync at a lower rate. This will mean fewer retries, and can be substantially faster than using a continually flip-flopping link. Each driver has its own method for setting the link speed. In Linux, set the link speed with iwconfig:

iwconfig eth0 rate 2M
This forces the radio to always sync at 2Mbps, even if other speeds are available. You can also set a particular speed as a ceiling, and allow the card to automatically scale to any slower speed, but go no faster. For example, you might use this on the example link above:

iwconfig eth0 rate 5.5M auto
Using the auto directive this way tells the driver to allow speeds up to 5.5Mbps, and to run slower if necessary, but will never try to sync at anything faster. To restore the card to full auto scaling, just specify auto by itself:

iwconfig eth0 rate auto
Cards can generally reach much further at 1Mbps than they can at 11Mbps. There is a difference of 12dB between the 1Mbps and 11Mbps ratings of the Orinoco card - that's four times the potential distance just by dropping the data rate!

Source : Linux tips every geek should know

Further reading :
Speed Up Slow WiFi Connection In Ubuntu Linux :
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Joined: 11 Oct 2009
Posts: 11919
Location: S.C. USA

PostPosted: Thu 09 Nov 2017, 13:58    Post subject:  

With Linux you have to be careful what you read and look very closely at when it was written.
Stuff changes a lot.

This info was written in February 28th 2009.

The other thing is Puppy Linux does some things the Puppy way and not the normal Linux way.

The things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected Shocked
YaPI(any iso installer) http://www.murga-linux.com/puppy/viewtopic.php?t=107601
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