Notices by Yes, I Know IT ! 🎓 (yesiknowit@mastodon.social), page 6

The Complete [and Definitive] Sed Command Guide

You will never need any other sed reference than this article crafted with love 💕... by myself
https://linuxhandbook.com/sed-reference-guide/

#sed #posix #gnu #linux #shell #command #reference

10 Practical Grep Command Examples for Developers
https://linuxhandbook.com/grep-command-examples/

#grep #posix #gnu #shell #command

Getting Started With the SED Command

New to `sed`? This is for you!
https://linuxhandbook.com/sed-command-basics/

#sed #posix #gnu #linux #shell #command

The largest functional processor:

https://www.youtube.com/watch?v=lNa9bQRPMB8

Featuring a ton of LEDs--because everybody likes seen blinking LEDs!

In the Bash, pressing <Alt-U> will convert to uppercase the word starting at the current cursor position

#Bash #Tip

Understanding "posits", an alternative to the IEEE-754 floating point formats for representing reals:

https://www.johndcook.com/blog/2018/04/11/anatomy-of-a-posit-number/ #FloatingPoint #IEEE754 #Posit

`make` is really a mythical tool in the Unix toolchest.
http://pkgw.github.io/make_for_scientists/

Many times criticized. Feared. Improved or imitated.

But still alive.

Tired of fighting against a bloated word processor when writing your latest report, novel, technical documentation or blog post?

Maybe that's the sign you ready to consider using a lightweight markup language. All you need is just a basic text editor, the knowledge of some simple and non-intrusive keywords and markup. And a processor to convert that text file to... well... whatever you want: HTML, PDF, LaTeX, ...

https://itsfoss.com/asciidoc-guide/
#AsciiDoc #Markdown #LaTeX #FOP

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

#Shell #Linux #Grep
#YesIKnowIT

Print even lines
seq 10 | sed -n '1b;P;N'

#Shell #Sed #Linux

In #Bash, to edit the last three commands in your favorite EDITOR type:

fc -3 0

When leaving the editor, commands are executed

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

#Linux #Shell #ls

seq 10 | awk NR%2
Keep odd lines of a file

#AWK #Shell

If you ever had to connect to an Oracle backend, you may know how painful it used to be to set up an Oracle Instance on your test/dev host.

Thanks to @Docker, it is now several orders of magnitude simpler!

https://yesik.it/EP18

#Oracle #Database
#Docker #Container
#Linux

In Bash `$(<file)` is equivalent to `$(cat file)`, but faster:

P=( $(</etc/passwd) )
echo ${P[0]}

#Bash #Linux #Cat

In a #sed substitution pattern, you can use any character as a separator instead of /
Useful for path or urls:
s!/usr/local!/opt!

#Linux #UNIX

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

When using the find command, use `-iname` instead of `-name` for case-insensitive search
#Unix #Linux #Shell #Find

If you ever had to connect to an Oracle backend, you may know how painful it used to be to set up an Oracle Instance on your test/dev host.

Thanks to @Docker, it is now several orders of magnitude simpler!

https://www.yesik.it/EP18

#Oracle #Database
#Docker #Container
#Linux
#YesIKnowIT

If you don't know what is #Awk or how it could help you processing text files, then you NEED that little introduction:
https://youtu.be/PUYS6MO4p7Y

#Linux #Shell #AWK
#YesIKnowIT