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add comment feature for all lessons
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‎docs/02.md

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# Day 2 - Basic navigation
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* [Lesson video](https://youtu.be/x_VBskTUzxg)

‎docs/03.md

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# Day 3 - Power trip!
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* [Lesson video](https://youtu.be/B6fDvmmh2_Q)

‎docs/04.md

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# Day 4 - Installing software, exploring the file structure
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* [Complementary video](https://youtu.be/d8JzxgGNAx4)
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* [Lesson video](https://youtu.be/d8JzxgGNAx4)
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## INTRO
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## EXTENSION
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* Use `mc` to view `/etc/apt/sources.list` where the actual locations of the repositories are specified. Often these will be “mirror” sites that are closer to your server than the main Ubuntu servers.
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* Read [Repositories - CommandLine
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](https://help.ubuntu.com/community/Repositories/CommandLine) for more of the gory details.
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* Read [Repositories - CommandLine](https://help.ubuntu.com/community/Repositories/CommandLine) for more of the gory details.
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## RESOURCES
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‎docs/05.md

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# Day 5 - More or less...
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* [Lesson video](https://youtu.be/SdvrCmhsm2M)
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* Get familiar with using `more` and `less` for viewing files, including being able to get to the top or bottom of a file in `less`, and searching for some text
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* Test how “tab completion” works - this is a handy feature that helps you enter commands correctly. It helps find both the command and also file name parameters (so typing `les` then hitting “Tab” will complete the command `less`, but also typing `less /etc/serv` and pressing “Tab” will complete to `less /etc/services`. Try typing `less /etc/s` then pressing “Tab”, and again, to see how the feature handles ambiguity.
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* Test how “tab completion” works - this is a handy feature that helps you enter commands correctly. It helps find both the command and also file name parameters, so typing `les` then hitting “Tab” will complete the command `less`, but also typing `less /etc/serv` and pressing “Tab” will complete to `less /etc/services`. Try typing `less /etc/s` then pressing “Tab”, and again, to see how the feature handles ambiguity.
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* Now that you've typed in quite a few commands, try pressing the “Up arrow” to scroll back through them. What you should notice is that not only can you see your most recent commands - but even those from the last time you logged in. Now try the `history` command - this lists out the whole of your cached command history - often 100 or more entries. There are number of clever things that can be done with this. The simplest is to repeat a command - pick one line to repeat (say number 20) and repeat it by typing !20 and pressing “Enter”. Later when you'll be typing long, complex, commands this can be *very* handy. You can also press `Ctrl + r`, then start typing any part of the command that you are looking for. You'll see an autocomplete of a past command at your prompt. If you keep typing, you'll get more specific options appear. You can either run it by pressing return, or editing it first by pressing arrows or other movement keys. You can also keep pressing `Ctrl + r` to see other instances of the same command you used with different options.
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‎docs/06.md

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# Day 6 - Editing with "vim"
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* [Complementary video](https://youtu.be/dNd3BvJNDIo)

‎docs/07.md

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# Day 7 - The server and its services
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* [Lesson video](https://youtu.be/VzXwO0qq-bg)

‎docs/08.md

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# Day 8 - The infamous "grep" and other text processors
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* [Lesson video](https://youtu.be/kG5JGJN5iTc)

‎docs/09.md

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# Day 9 - Diving into networking
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* [Lesson video](https://youtu.be/47BWW-SyAa8)

‎docs/10.md

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# Day 10 - Getting the computer to do your work for you
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* [Complementary video](https://youtu.be/ktjabe8enxU)

‎docs/11.md

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# Day 11 - Finding things...
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* [Lesson video](https://youtu.be/gQ9nP9PN8KA)

‎docs/12.md

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# Day 12 - Transferring files
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* [Lesson video](https://youtu.be/qjd5eazfoC0)

‎docs/13.md

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# Day 13 - Users and Groups
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* [Lesson video](https://youtu.be/mBcExazxLU8)

‎docs/14.md

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# Day 14 - Who has permission?
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* [Lesson video](https://youtu.be/mBcExazxLU8)
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Also, SELinux and AppArmour:
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* [SELinux man page](https://manpages.ubuntu.com/manpages/impish/en/man8/selinux.8.html)
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* [SELinux User's and Administrator's
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* [SELinux User's and Administrator's Guide](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/pdf/selinux_users_and_administrators_guide/red_hat_enterprise_linux-7-selinux_users_and_administrators_guide-en-us.pdf)
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* [SELinux For Mere Mortals](https://craigmbooth.com/blog/selinux-for-mortals/)
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* [Securing Ubuntu 18 04 with Apparmor](https://www.youtube.com/watch?v=lJFxexGZ-DY)
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‎docs/15.md

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# Day 15 - Deeper into repositories...
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* [Complementary video](https://youtu.be/DMenSNaMiD4)
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* [Lesson video](https://youtu.be/DMenSNaMiD4)
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* [Complementary video](https://www.youtube.com/live/2lYo_FJxQR8?feature=shared)
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## INTRO
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Early on you installed some software packages to your server using `apt install`. That was fairly painless, and we explained how the Linux model of software installation is very similar to how "app stores" work on Android, iPhone, and increasingly in MacOS and Windows.
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Today however, you'll be looking "under the covers" to see how this works; better understand the advantages (and disadvantages!) - and to see how you can safely extend the system beyond the main official sources.
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## YOUR TASKS TODAY
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* Add a new repo
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* Remove a repo
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* Find out where to get a program from (apt-search)
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* Install a program without apt
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Any particular Linux installation has a number of important characteristics:

‎docs/16.md

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# Day 16 - Archiving and compressing
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This creates _myinits.tar_ in your current directory.
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**Note 1:** The `-f` switch specifies that _“the output should go to the filename which follows”_ - so in this case the order of the switches is important. **VERY IMPORTANT**: `tar` considers anything after `-f` as the name of the archive that needs to be created. So, we should always use `-f` as the last flag while creating an archive.
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**Note 2:** The `-v` switch (verbose) is included to give some feedback - traditionally many utilities provide no feedback unless they fail.
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(The cryptic “tar” name? - originally short for "tape archive")
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‎docs/17.md

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# Day 17 - Build from the source
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(Another big part of what package managers like `apt` do, is to identify and install any required "dependencies". In the Linux world many open source apps take advantage of existing infrastructure in this way, but it can be a very tricky thing to resolve manually. However, the app we're installing today from source is relatively unusual in being completly standalone).
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## YOUR TASKS TODAY
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* Download a source code tarball
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* Extract and build the source
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## FIRST WE NEED THE ESSENTIALS
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Projects normally provide their applications as "source files", written in the C, C++ or other computer languages. We're going to pull down such a source file, but it won't be any use to us until we compile it into an "executable" - a program that our server can execute. So, we'll need to first install a standard bundle of common compilers and similar tools. On Ubuntu, the package of such tools is called “build-essential". Install it like this:

‎docs/18.md

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# Day 18 - Log rotation
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# Day 18 - Logs, monitoring and troubleshooting
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* [Lesson video](https://youtu.be/sd5NFUo5JYM)
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‎docs/19.md

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# Day 19 - Inodes, symlinks and other shortcuts
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The VFS is a key part of Linux, and an overview of it and some of the surrounding concepts is very useful in confidently administering a system.
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## YOUR TASKS TODAY
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* Create a hard link
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* Create a soft link
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* Create aliases
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## THE NEXT LAYER DOWN
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Linux has an extra layer between the filename and the file's actual data on the disk - this is the _inode_. This has a numerical value which you can see most easily in two ways:

‎docs/20.md

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# Day 20 - Scripting
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* [Complementary video](https://youtu.be/G7GyMuyauVk)

‎docs/21.md

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# Day 21 - What next?
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* [Complementary video](https://youtu.be/MW9q6NWNDyM)

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