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

You want to build a Raspberry Pi cluster?
So, let's talk about some low-cost options for the boards mechanical assembly!

https://yesik.it/EP21
#RaspberryPi #RPi #Cluster #Hardware #DIY #HowToVideo #YesIKnowIT

How to break long files in smaller parts based on delimiters? Using the `csplit` utility!

https://linuxhandbook.com/csplit-command
#csplit #Linux #GNU #CoreUtils #Command

Still hesitating between #Vim and #Emacs?
Why not take a look at #spacemacs?

http://spacemacs.org/

Not all you can do with sed, but a cool reminder for the most basic use cases:
https://www.yesik.it/SEDCS1

#sed #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

With Bash history, `^str1^str2^` will repeat the previous command replacing `str1` by `str2`

echo 1223
^2^4^

#Bash

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

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

Glob patterns, from the basics to subtle corner cases:
https://www.yesik.it/EP11

#Linux #Shell #Bash #GlobPattern
#YesIKnowIT

Print odd lines
seq 10 | sed -n 'P;N'

#Shell #Sed #Linux

The #Bash has the notion of "integer" variable:

declare A=1; declare -i B=2
A+=3; B+=4
echo $A $B
⇒ 13 6

#Shell

You know the "globstar" feature of your Bash ?
Let's talk about that !
https://youtu.be/N8zAA7GG56g

#Linux #Bash #Globstar

In Bash `~sylvain` is expanded to the home directory of the user whose login is 'sylvain'

I don't know if this works with other usernames though...
;)

#Bash #Shell

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

#Shell #Sed #Linux

The sed substitution (s) command is by far the most useful. But did you know ALL these patterns:
https://www.yesik.it/EP08

#Linux #Sed
#YesIKnowIT

In AWK a pattern without associated action defaults to '{ print }':
So those two commands are the same:

seq 10 | awk /1/ is the same as
seq 10 | awk '/1/ {print}'

#Shell #AWK

OS Containers vs Application Containers

Read to know the difference between #Docker and #LXD

https://blog.risingstack.com/operating-system-containers-vs-application-containers/ …

#Containers

Software License comparator:
https://tldrlegal.com/

`‥ | read ‥` is not portable between #zsh and #bash

Compare in both shells :
echo 1 | read X; echo $X

A quick reminder to myself:

• x86 ≡ Original 16 bits architecture [8086⎇]
• x86-32, IA-32 ≡ Intel 32 bits extension to x86 [80386⎇]
• x86-64, AMD 64, Intel 64 ≡ 64 bit extension to x86 [AMD Opteron⎇]
• IA-64 ≡ Intel Itanium architecture

#x86 #Itanium #AMD #Intel

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

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