Notices by Yes, I Know IT ! 🎓 (yesiknowit@mastodon.social), page 7

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

Check your Bash skills and challenge your friends:
https://www.yesik.it/BASH-IT-OUT

#Bash #Shell #Challenge #Puzzle #Linux
#YesIKnowIT @itsfoss2

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

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

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

Does the opensource adoption in public services have evolved since I published that?
https://itsfoss.com/open-source-adoption-europe/ …

#FOSS #OpenData
#eGovernment #PublicAdministrations
#EU #Europe
#YesIKnowIT @itsfoss2

Print the first column of a space-separated data file:
awk '{print $1}' data.txt # Print out just the first column

For some unknown reason, I find that easier to remember than:
cut -f1 data.txt

#Linux #AWK #Cut

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

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

```
time read
```

#Linux #Shell #Stopwatch

How to use the `chattr` command to secure shared files. An interesting post by Himanshu Arora on HowtoForge.
https://www.howtoforge.com/linux-chattr-command/

BTW, `chattr` has not to be confused with `chmod`!

#Chattr #Linux #Utility

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

Excellent post by @benfrederickson showing the programming language popularity on @GitHub as of Jan, 2018
https://www.benfrederickson.com/ranking-programming-languages-by-github-users/

Do you think things have evolved since that post?

Take a little bit of computer history and a little bit of computer science, mix them together and you have that article introding the fundamental unit of measurement used in computing or electronic engineering.

https://www.yesik.it/blog/2018-bit-nibble-byte-and-word