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Most of us know how to use awk to print the nth column of a file:

$ awk '{print $1}' /etc/hosts

will print all IP addresses from /etc/hosts

But you can also do filtering before printing the chosen column:

$ awk '$5 >= 2 {print $2}' /path/to/file

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Now I can use that to find out all deployments on my openshift cluster, where the number of current replicas is greater than 2.

$ oc get deployments --all-namespaces | awk '$5 >= 2 {print $2}'
NAME
oauth-openshift
console
downloads
router-default
etcd-quorum-guard
prometheus-adapter
thanos-querier
packageserver

I know that openshift/kubernetes both have a powerful query selector syntax, but for the moment awk will do.

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Since this info was too well hidden on the internet, here is the information:

cvlc v4l2:///dev/video0

and there you go.
If you have multiple cameras connected, you can try /dev/video0 up to /dev/video5

Recommended keyboard settings for Productivity and Usability, for European Programmers

TLDR: setxkbmap -layout us -variant altgr-intl and become a happier programmer.

The case for QWERTY for European Programmers

If you’re working on Unix / Linux, or C based programming languages, it can make sense to switch to the qwerty(us) keyboard layout. Why ?
Unix, C, Perl, Java, and most of programming languages have been conceived on QWERTY keyboards.
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To give an example, using an Unix shell you have to type the dot . and slash / symbols quite often to navigate the filesystem. The two keys producing these symbols, are nicely aligned on a QWERTY layout and do not require a key combination to be entered. So you can quickly enter something like ‘../..’ using a single hand.
Now using a QWERTZ layout, like in Germany / Austria, you have the ‘.’ symbol easily accessible, but you need to combine two keys ( Shift + 7 ) to get a ‘/’.
And if you are a poor soul using an AZERTY layout, to get the ‘.’ and ‘/’ symbol you need each time a key combo.
The need of key combos is bad not only for speed (multiple keys to lookup) but also for usability,  as you have to stretch your fingers to reach the key if using a single hand, provoking repetitive strain injury. You might be smiling but this is commonly known amongst Emacs Users, due to the prominent use of commands using Ctrl and Alt combos, and led to the creation of an Emacs Ergonomic wiki.

This goes as well for many symbol commonly used in programming languages, think for instance about the  semicolon ‘;’ for terminating a statement, the ‘[’, and ‘]’ symbols for defining an array, and the backslash ‘\’ for escaping.
All these keys are accessible via a single keypress on qwerty and require key combos on qwertz and azerty. No wonder Linux, Minix and BSD were invented on non-azerty layouts: in France we were still busy typing the path to the source code, when in other parts of the world people already had the file open in their editor.
You don’t need to throw away your existing keyboards when learning the qwerty (us) layout: for a couple of euros, you can find on ebay alternate keys stickers to put on your laptop.

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Now if you want to switch to a qwerty keyboard layout, and you’re French or German, you might wonder how to access the characters with diacritics, the é and è of French and ü and ö of German.
Fortunately there is a very clever keyboard variant for the us layout who uses the AltGr key, to make all these keys accessible, just hiding them behind the AltGr key.
Need é ? that’s just AltGr + e away. Needs ç ? That’s just AltGr + , Needs ö ? AltGr +p
See the coolness of that ? You can type all international diacritics in an easy way, and there are even keyboard stickers for that too.

Now how to access to this layout of wonder ?
You can configure the layout and variant in Xorg, in debian/ubuntu that would be entering in /etc/default/keyboard

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After restarting the X server, you can check that the settings have been applied with

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If using Gnome, you can also set the keyboard layout and variant by changing the schema《暗黑破坏神3》台湾战网账号注册及战网资格激活流程-游迅网:2021-5-10 · 《暗黑破坏神3》台湾战网账号注册及战网资格激活流程，游迅网为您提供暗黑破坏神3最新新闻动态、暗黑破坏神3图文攻略、视频攻略大全等，暗黑破坏神3新闻攻略尽在游迅网。, which will override the desktop-agnostic settings of /etc/default/keyboard.
For this you can either call

dconf write /org/gnome/desktop/input-sources/sources "[('xkb', 'us+altgr-intl')]"

or navigate with the gui tool dconf-settings to 豆荚加速器官网下载 and set the value there.

If you want to further improve your keyboard layout, you can also have a look at swapping Ctrl and Alt, as described here (French language article) Happy hacking !

Putting a Red Hat on

I am switching jobs, and after a two year stint as a full stack developer at BPMasters, I am joining Red Hat as a 豆荚加速器首页 (Platform and Openshift). A good friend of a good friend already worked at Red Hat, and advised me to apply, which I did, and I am starting in May in Vienna, the place where I live.
I have heard that there is already a number of Debian Developers working for Red Hat, so if you happen to be one of them, I hope we’ll get in touch !

Two Factor Authentification on gitlab with Yubikey

I wanted to have a working Two Factor Authentification (2FA) setup to login on salsa.debian.org, Debians’s gitlab instance.
You might already know Two Factor Authentification via a One Time Password (OTP) generating app on your smartphone, like FreeOTP or Google Authenticator. But it is possible to use a physical device, and a keypress on the device is enough to authenticate (speed up things !). Here I am using a Yubikey 4, a popular USB device for Two Factor Authentification which is officially supported by gitlab, and whose tooling is well packaged in Debian.

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Install the needed packages to work with the yubikey

# apt install yubikey-manager libu2f-host0

List connected devices on your usb bus:

$ lsusb
Bus 002 Device 109: ID 1050:0407 Yubico.com Yubikey 4 OTP+U2F+CCID

Get info about the device capability

$ ykman info
Device type: YubiKey 4
Serial number: 1234567
Firmware version: 4.3.7
Enabled USB interfaces: OTP+FIDO+CCID
Applications
OTP         Enabled             
FIDO U2F    Enabled             
OpenPGP     Enabled             
PIV         Enabled             
OATH            Enabled             
FIDO2       Not available

The capability which interests us here is FIDO U2F. The Yubikey 4 supports Two Factor Authentification via the U2F standard, and this standard is maintained by the FIDO Industry Association, hence the name. As I plan to only use the FIDO U2F capability of the key, I set ‘FIDO’ to be the single mode of the key.

ykman mode FIDO

Testing web browser interaction with Yubico demo system

Now we need to have to have a browser with support for the U2F standard. Firefox has builtin support since Version 67. Debian 10 “Buster” has 豆荚加速器官网下载 Version 68, so that will work. For testing yubikeys, the manufacturer has a demo website, where you can test U2F. Go to http://demo.yubico.com and follow the “Explore the Yubikey” link.
Once there you will be asked to register an account on yubicom’s demo systems, to which you will add the Yubikey as an Authenticating Device. After that you can add your security key. First step will be to register the device, which will require a light touch on the Yubikey button, and acceptance of this Firefox warning Window, as the demo website wants to know the model of the device.

Firefox message on the yubikey demo site. A normal site with U2F would not require the extended information, and have a simpler popup message.

As soon as the device is registered, you can login and logout and you will be prompted again to lightly touch the Yubikey button to authenticate, in addition to the classical login / password.

Using U2F on gitlab

When you want to register your yubikey for logging on salsa, you need first to register a One Time Password device in Settings -> Account -> Manage two-factor authentication, and Register Universal Two-Factor (U2F) Device. After the usual Firefox Popup, and the light touch on the key button, that'it you have a fast, and reliable Two Factor Authentification !

Conclusion

Each time I have to look on anything close to cryptography / authentification, it is a terminology avalanche. Here we had already 2FA, OTP, U2F, FIDO. And now there is FIDO2 too. It is the next version of the U2F standard, but this time it was named after the standardizing organization, FIDO. The web browser part of FIDO2 is called Webauthn. Also sometimes the whole FIDO2 is called Webauthn too. Easy to get, isn’t it ?

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I have somewhere in the basement a DEC Vax workstation, but in the end it was a bigger fun to run an emulated Vax 11/780 (size of two refrigerators) in Beagle Bone Black (size of a big matchbox). For this I used the Dockerfiles available in this git repo using the simh emulator, and tweaked a bit for ARM.
I recorded the boot sequence with the very nice asciinema, also available in the Debian archive, so here is 4.3 BSD, in all its 1986 glory.

Mark a Screenshot on Linux

More that than often to explain things quickly, I like to take a screenshot of the (web) application I am talking about, and then circle the corresponding area so that everything is clear. Possibly with a rounded rectangle, as I find it the cutest variant.

This is how I do it on Linux:
Install necessary tools:

apt install gimp scrot                                                                   

Take the screenshot:

# Interactively select a window or rectangle with the mouse                              
scrot --selection screenshot.png                                                                    

Open the screenshot and annotate it with gimp:

gimp screenshot.png                                                                      

Then in gimp:

• Tools -> Selection Tools -> Rectangle Select, and mark the area
• Select -> Rounded Rectangle, and keep the default
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• Edit -> Stroke selection

Maybe gimp is a bit overkill for that. But instead of learning a limited tool, I prefer to learn an advanced one like gimp step by step.