Learn to use Linux commands, SysAdmin tools, Self-hosting, Docker and other DevOps stuff with us.
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No disrespect to Linus Torvalds, but this guy is the greatest geek alive 🫡
Created UNIX in 1971 when he was 28 years old.
Created Go in 2009 when he was 66 years old😲
He also developed the B programming language (which led to C), created UTF-8 encoding (making international text possible online), and designed essential tools like grep that developers still rely on daily.
He also helped with the development of Multics (that led to UNIX), Plan 9 from Bell Labs and Inferno operating systems.
That's 4 operating systems in total... Most people don't even use these many OS.
Pretty impressive resume, right? 🔥
And it's a shame that many people, even the ones in the IT and tech industry, don't know him.
Ken Thompson.... Remember the name 🙏
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Rome was not built in a day, but grep was (sort of) 😎
The origin story behind the creation of grep utility is fascinating.
The co-creator of the UNIX operating system, Ken Thompson, developed grep 'overnight'.
Actually, he had a personal tool for searching for text in files.
His department head Doug McIlroy came to him and said, "You know it would be really great if we could look for things in files".
"I'll think about it overnight", said Thompson.
He went back home and modified the code in his tool to fix bugs. Took him an hour at most.
The next day, he presented it to McIlroy and he exclaimed,
"This is exactly what I wanted"
And the rest is history.
If you are wondering why the utility is called grep and not search, there is perfectly good logic behind it 👇
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Couldn't afford UNIX, created Linux in 1991
Couldn't afford BitKeeper, created Git in 2005
Linus Torvalds is a Rockstar 🤩
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LINUX USERS ARE NOT HACKERS!
LINUX USERS ARE NOT HACKERS!
LINUX USERS ARE NOT HACKERS!
LINUX USERS ARE NOT HACKERS!
LINUX USERS ARE NOT HACKERS!
LINUX USERS ARE NOT HACKERS!
LINUX USERS ARE NOT HACKERS!
LINUX USERS ARE NOT HACKERS!
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33 years ago, Torvalds announced the Linux project 🐧
"Just a hobby, won't be big and professional"
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When you reboot after optimizing your Linux server and now you cannot SSH into it
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| I Love Linux |
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Linus Torvalds could not afford a UNIX license
So, he created Linux.
BitKeeper revoked free license for Linux development
So, he created Git.
This guy is the definition of genius 👏
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Me: Experienced sysadmin with 10+ years of using Linux.
Also me: Googles "how to archive files with tar command in Linux"
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The Linux filesystem and directory structure every Linux user should know 🐧
It's a long but bookmark worthy thread
🧵👇
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┏━━┓┏━━┓┏━━┓┏━━┓
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┏━┛┃┃┃┃┃┏━┛┃┏━┛┃
Use Linux
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Latest addition to my library 📚
Pretty amazing Linux book with lots of practical tips.
Good job @DanielJBarrett 👏👏
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Automate tasks in Linux with cron jobs and enjoy the holiday season 🐧❄️☃️
This cron cheat sheet will help you with that 👇
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Me pressing the up arrow key to look for that Linux command I ran yesterday 😎🫣
(Instead of doing ctrl+R)
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34 years ago, a 21-year-old Finnish computer science student sent a mail announcing that he was working on a new operating system which was ‘just a hobby, won’t be big and professional’
Can you guess which operating system it was?
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Most new Linux users do not understand the difference between
- Terminal
- Command line
- Shell
- Prompt
Here's what you should know about it 👇
Terminal: It is a graphical application that runs a shell by default. There can be many terminal emulator applications like Terminator, Konsole etc.
Shell: It is difficult to "visualize" separately from the terminal. The terminal runs a shell, usually Bash shell. Like terminals, there are various shells as well, zsh, bash, fish etc.
Prompt: This is what you see before the space where you type the commands. There is no set standard for the prompt. In some old terminals, you would just have a blinking cursor to the place where you can type the commands. In modern terminals, prompt gives you some information like username, hostname and current working directory.
Command line: It is not something specific to Linux. Every operating system has a command line interface. Many programming languages have command line interfaces. It’s a term for the interface where you can run and execute commands.
Typically, you type the commands in a terminal after the prompt and the commands are interpreted by the shell.
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This will help you understand Linux file permissions
Thanks to the infographic by @alexxubyte 🙏
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|￣￣￣￣￣￣￣￣￣￣￣￣￣￣ |
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| If it's your side project |
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The ls command is used every day by 99.9% of Linux users 🐧🐧
And yet most people don't utilize its full potential 🤷
Here are 7 ls options you probably didn't know (but you should)👇🧵
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This is perhaps the most comprehensive Linux book 📕
Covers a wide variety of topics ✅
Running over 800 pages 📄
From the basics of Linux command line to advanced sysadmin topics,
You get everything 🐧
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Almost all Linux users use the cat command to display file contents.
But only a few are aware of these unusual options 👇🧵
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🔒 The Lesser Know Story of SSH Port 22 🔒
Ever wondered why SSH port 22 is the default choice for secure remote connections? 🤔
Finnish computer scientist Tatu Ylonen wrote the initial version of SSH in the Spring 1995.
Telnet and FTP were widely used at that time and SSH was written to replace both.
Interestingly, the port number 22 was free andit was right between FTP port 21 and Telnet port 23.
Tatu took the opportunity and used port number 22 to beta test SSH.
The port number remains the default port for SSH till day.
Here's the email announcing the SSH project 👇
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How to be Master of Linux 🐧?
1. Search the web for the error
2. Check the forums for the solution
3. Read answers other than the accepted solution
4. Try to understand the root cause of the problem
5. Repeat ♻️
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🐧 Linux is Amazing
🐧 Linux is in Demand
🐧 Linux is the Future
I learned Linux by spending $0 on my own
You can also start learning Linux with these free online courses 👇🧵
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🚀 Quick Linux Tip
Want to quickly find the largest files eating up your disk?
$ du -ah / | sort -rh | head -n 10
Shows top 10 biggest files/folders from root.
Great for cleaning up space on your Linux server.
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Bash scripting is an essential skill for any Linux user 🐧
Want to start learning bash script?
We have a 10-part tutorial series available for FREE 👇
linuxhandbook.com/tag/bash-b…
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When everyone is using automation with Dicker, Kubernetes etc
But you got legendary old schools skill to do it manually 🤭🤣
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Know your ports, Linux folks 🐧
There are 65,535 network ports available on Linux.
They are divided into following three categories 👇
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UNIX was developed on this computer model by Ken Thompson and Dennis Ritchie
Can you guess which computer is it?
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When looking at the RAM usage of a Linux server,
people often focus on FREE memory ❌
They should instead focus on available memory ✅
Let me explain why
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💡 Linux tip of the day
Use brace expansion with mkdir -p to create multiple nested directories in one go!
This oneliner
$ mkdir -p projects/{frontend,backend}/{src,test,docs}
will create 6 directories instantly 👇
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Understanding the filesystem and its hierarchy is crucial for Linux users 🐧🐧
Quickly learn about them in this thread 🧵👇
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