Yes, I Know IT ! 🎓 @YesIKnowIT@mastodon.social

JSON command line processing:
https://stedolan.github.io/jq/

(never ever use #sed for that!)
#JSON #CLI

Delete the last line of a file:
sed '$d' file

#Shell #Sed #Linux

Merging files on a line-by-line basis with the `paste` utility
https://yesik.it/EP23

#Paste #POSIX #Utility #Linux #Unix #Shell

Do you want to run a Windows software on Linux? Or optimize your costs by running several virtual servers on the same hardware? In those cases, like in many other ones, virtualization is the technology to leverage.

But with so many different virtualization technologies readily available today, which one is the best for YOUR needs?
https://yesik.it/VIRT101
#VM #Containers #Emulation #Wine #CheatSheet

`jq` is the tool to know for anyone having to process JSON logs or data.

https://stedolan.github.io/jq/

If you like `sed` you will like `jq`!

#JSON #Jq

Want to know the oldest file in your disk?

find / -type f -printf '%TFT%.8TT %p\n' | sort | less
(should work on any Single UNIX Specification compliant system)
#UNIX #Linux

Looking for an explanation of what is the kernel and how it relates to userspace applications?
Take a look at that video:
https://yesik.it/EP09

#Kernel #Linux
#YesIKnowIT

Hacking Ikea Trådfri devices
https://trmm.net/Ikea/

by Trammell Hudson (https://twitter.com/qrs)
#SiLabs #EFR32 #ARM
#MicroPython

In the Bash, pressing "ctrl-x ctrl-v" will display its version informations.

#bash #linux

So, you don't know yet the `grep` command ?
https://youtu.be/HBNNO92Juw4

#Shell #Linux #Grep
#YesIKnowIT

http://www.ostechnix.com/4-easy-ways-to-generate-a-strong-password-in-linux/

My preferred :
openssl rand 14 -base64
gpg --gen-random --armor 1 14

... but the passwords are not easy to remember. A good argument to use a password manager.
#password #linux #gpg #openssl

XML command line processing:
http://xmlstar.sourceforge.net/

(never ever use #sed for that!)
#XML #XSLT1 #CLI

`less -R` will handle gracefully ANSI "color" escape sequences:
ls --color=always /tmp | less -R

#Linux #Shell #ls

How to Run a Web Server from a Docker Container?
https://www.yesik.it/EP16

#Docker #Container #Apache #HTTP #WebServer
#YesIKnowIT

`nagios` popularity according to Google Trend (normalized to max 100)

Can't you see a pattern here?

BTW, by what have you replaced Nagios? If you did it, of course...
#Nagios #Network #Monitoring

In JavaScript the "empty" regular expression literal is written `/(?:)/` since the parser would erroneously take `//` as the start of a single-line comment

https://www.ecma-international.org/ecma-262/5.1/#sec-7.8.5
#JavaScript #ECMA #Empty #RegExp

All about JS symbols. What they are for -- and what they aren't:
https://www.keithcirkel.co.uk/metaprogramming-in-es6-symbols/

#Javascript #Symbol

20 files to rename. 5 seconds per file. 1"40 of boring work?
No: 15 seconds if you know the right command
https://yesik.it/EP04

#Shell #Rename #PRename

From a POSIX shell `$OLDPWD` holds the name of the previous working directory:
cd /tmp
echo You are here: $PWD
echo You were here: $OLDPWD
cd $OLDPWD

#Unix #Linux #Shell #cd

vlc -Idummy -Vcaca "Star Wars: Episode IV - A New Hope (1977).mkv"

Play #StarWars as it was originally intended by @GeorgeLucasILM back in the 70s

#VLC #AsciiArt #Linux #CommandLine