Notices by Yes, I Know IT ! 🎓 (yesiknowit@mastodon.social), page 4

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

Centering text on 80 columns with stars:
sed -E ':x
s/^.{,80}$/*&/
s/^.{,80}$/&*/
tx
' file

#Shell #Sed #Linux

Delete all but the last line of a file:
sed -n '$p' file

#Shell #Sed #Linux

Intriguing. What is the typical use case of running Docker on a RaspberryPi w/ Raspian?

https://docs.docker.com/engine/installation/linux/docker-ce/debian/
#Docker #RPi #RaspberryPi #Raspian

To leave #vim with a non-zero exit code use `:cq`.

Useful to abort a #Git commit or a #Bash `fc` command

Cool tutorial by @shapeshed on the "join" command. Useful to merge files based on their content.

https://shapeshed.com/unix-join/

#Join #Linux

AWK patterns are far more sophisticated than their SED counterpart:
https://www.yesik.it/EP13

#AWK #Linux #Unix
#CommandLine
#YesIKnowIT

"I want to learn Linux. Is Kali right for me?"

So, tired of the sterile controversies, I decided to forge my own opinion:
https://itsfoss.com/kali-linux-review/

#Linux #Kali

In the Bash, `~-` is expanded to the content of `OLDPWD`. So:

cd ~-/..

is a shortcut for the 2 commands:

cd "$OLDPWD" (or `cd -`)
cd ..

#Bash #Shell

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

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

Find words starting with `lin` (according to `/usr/share/dict/words`):

```
look lin
```

#Linux #Look #Utility

csplit tweets.yaml /----/ '{*}'

Split a collection of tweets stored in a YAML file into individual items.

From https://linuxhandbook.com/csplit-command

Poor's (wo)man stopwatch in your shell:

```
time read
```

#Linux #Shell #Stopwatch

Display a 2x3 matrix:

seq 6 | paste - - -

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

Do you know I have a "Bash and Linux Command Line" course On #Udemy?
Take a look here for a discount:
https://yesik.it/BSH101

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

.tar, .zip, .gz--you already have seen those extensions at the end of archive files, don't you?

But what do they mean? What is the difference between those formats?

https://itsfoss.com/tar-vs-zip-vs-gz/
#Tar #Zip #Gzi #Archive #FileFormat

Split a fixed-width or delimited text file into individual columns using the `cut` command
https://yesik.it/EP22

#Cut #POSIX #Utility #Linux #Unix #Shell

`split` and `csplit`. Old friends, I used them a lot in the 1.44MB floppy disk era...

https://www.linux.com/learn/intro-to-linux/2017/8/splitting-and-re-assembling-files-linux
by Carla Schroder (https://twitter.com/CarlaSchroder)

I should definitely investigate Asciinema for my future screencasts:

https://asciinema.org/

#Asciinema #Terminal #Screencast