Unlocking the mysteries and best practices of the sudo command. Learn its history, uses, and its significance in the DevOps culture.

Sudo Mastery: A Comprehensive Guide to Sudo Best Practices.

  • Last Modified: 01 Sep, 2023

This comprehensive guide takes you through the essentials and intricacies of sudo. Understand how to use it efficiently and responsibly, explore its history, and anticipate its future.

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Hey there, future sudo master! 🌟 Ever found yourself stuck with “permission denied” while tinkering around on your Linux or Unix system? Yeah, that can feel like someone put a speed bump on the Autobahn. But don’t fret. That’s where our caped crusader, the sudo command, swoops in to save the day!

So what’s sudo? Imagine having a VIP backstage pass at a rock concert—that’s what sudo does for you in the computer world. It temporarily turns you from an average Joe user into a superuser with the ‘keys to the kingdom,’ letting you perform tasks you’d otherwise be restricted from. Sounds cool, right? Buckle up, because we’re not just gonna gloss over what everyone already knows. Nah, we’re digging deeper. From the nuts and bolts to cultural trivia, edge cases, and even some gossip (Shh!), we’re covering it all.

Oh, and by the way, “sudo” stands for “SuperUser DO.” Kinda like a superhero’s catchphrase, right? 🦸‍♂️

Ready to embark on this epic journey to sudo mastery? Let’s get this show on the road!

History and Origin

Hold on to your hats, folks, because we’re about to hop into a time machine and take a trip down memory lane. Ever wonder who we should be tipping our hats to for the creation of sudo? Well, the command has its roots way back in the ’80s. The first version was penned by Bob Coggeshall and Cliff Spencer around 1980. Yep, the same decade that gave us neon leggings and hair metal also gifted us this powerhouse of a command.

Coggeshall and Spencer were working in the Department of Computer Science at SUNY/Buffalo, trying to solve a fundamental problem: How could sysadmins perform privileged tasks without exposing the super-secret root password to everyone and their grandma? Voila! sudo was born to fill that gap.

But here’s where things get juicy. In 1985, a dude named Todd C. Miller took it upon himself to rewrite sudo to make it even better. He added tons of new features and has been the maintainer of the project ever since. The man’s a rock star in the UNIX world—think of him as the Slash of sudo. 🎸

And get this: the name “sudo” itself is kinda legendary. While “SuperUser DO” is the full form most people throw around, the creators cheekily said it’s also short for “substitute user, and do.” See what they did there? It’s not just a command; it’s a play on words! How’s that for adding a little seasoning to your command line soup?

What’s really intriguing is the open-source ethos surrounding sudo. It thrived and grew, not in some secret corporate lab but in the vast realm of the open-source community. Like a garden getting love and sunshine from developers globally, sudo has matured into a versatile tool that’s integral to UNIX-based systems today. Its source code is available for anyone to scrutinize, improve, or fork, encapsulating the real spirit of community-based development.

So next time you type in a sudo command, just remember, you’re not merely executing code; you’re a part of an epic saga that spans decades and reflects the collaborative human spirit.

What is Sudo?

Alright, enough of the nostalgia. Let’s roll up our sleeves and get to work. What the heck is sudo, and why should you care? If you’ve ever used a Unix or Linux system (and hey, macOS counts too), you’ve probably encountered this magical command. It’s like a golden ticket that grants you temporary admission to the Wonderland of Administrative Privileges. 🎩🐇

In geeky terms, sudo allows a permitted user to execute a command as another user (commonly as the root user). That’s right; it’s your backstage pass to the system, allowing you to override security restrictions. However, this isn’t a “no questions asked” situation. Your name has to be on the VIP list, a.k.a the /etc/sudoers file, which we’ll dive deep into later. Just remember, with great power comes great responsibility. No, seriously. You can wreck your system if you’re not careful. 🛑

So, what are some typical use-cases? Oh boy, the possibilities are endless:

  • Want to install a new software package? sudo apt-get install [package-name]
  • Need to edit a protected file? sudo nano [file-path]
  • Want to show off your superuser status to your friends? sudo make me a sandwich (okay, maybe that last one doesn’t actually work, but you get the idea!)

But here’s a little secret: sudo is not just about elevating your user privileges; it’s about auditing and controlling them. Each sudo command is logged, so system administrators can keep an eye on who did what. It’s like the Gandalf of your system—allowing you to pass but always keeping a watchful eye. 🧙‍♂️

Also, sudo is pretty darn customizable. You can set up specific permissions for different users or even commands. Imagine if your backstage pass only allowed you into the dressing rooms but not onto the stage itself. That level of granularity is entirely possible with sudo.

So yeah, sudo is more than just four letters you type before a command. It’s a powerful, versatile tool that lets you perform a variety of system functions you wouldn’t otherwise have access to. But before we get carried away, remember: it’s not a toy. It’s a tool, and like any tool, you’ve got to know how to use it properly.

The Philosophy Behind Sudo

Time to get a little brainy. 🧠 Ever wondered why sudo exists in the first place? I mean, sure, it’s cool to have superpowers and all, but there’s a deeper reasoning here, deeply rooted in the Unix philosophy. Unix is like that wise old sage that values minimalism, modularity, and, most of all, granting power cautiously.

Unix philosophy is all about “Do One Thing and Do It Well.” Each program, each command is designed to perform a single task effectively. But hey, just because a program can do one thing well doesn’t mean it should have the power to do everything. That’s just asking for chaos. Imagine if every app on your phone had complete access to all your data. Not so fun, huh?

Enter sudo. It acts as the gatekeeper, making sure that the powers-that-be (or in this case, the powers-that-run) are only granted to those who really need it, when they need it. So sudo isn’t just about lifting restrictions; it’s about implementing a more nuanced, layered form of security that aligns perfectly with the Unix philosophy of ’less is more’.

Ken Thompson, one of the founding fathers of Unix, famously said, “You can’t trust code that you did not totally create yourself.” While this can be a bit extreme, the concept emphasizes caution and restriction, unless absolutely necessary. This sentiment is also reflected in the way sudo operates. You’re only given the ‘keys to the castle’ temporarily and often for very specific reasons. It’s like your parents giving you the car keys but reminding you it’s only for driving to the library to study (but we all know a detour to the ice cream shop is tempting).

Also, the original Unix designers emphasized the importance of making things that are not only useful but also beautiful in their simplicity. sudo is a masterpiece in this sense—so elegantly simple, yet so deeply impactful. It’s not just a command; it’s a mini-course in the philosophy of Unix each time you use it.

So the next time you elevate your privileges using sudo, remember that it’s more than a quick hack to bypass restrictions. It’s a manifestation of a deeper design philosophy that values caution, responsibility, and the elegant distribution of power.

How Does Sudo Work?

Alright, so you’ve got the gist of what sudo is and the grand philosophy behind it. Now, let’s get our hands dirty and dissect this bad boy. How the heck does sudo actually work? 🤔

First off, you’ve gotta understand the /etc/sudoers file. This file is like the bouncer at an exclusive nightclub, checking names against the VIP list. If you’re in there, you’re good to go. It’s a configuration file that specifies which users can run what. To take a peek at it, just type sudo visudo in your terminal. But a word of caution—handle with care! Messing up this file can lock you out of elevated privileges. Eek!

Once your credentials are verified against the /etc/sudoers file, sudo works by invoking a new shell or process that runs with elevated privileges. In simple words, it’s like donning a superhero cape for a short period. This elevated shell can be that of another user, but most commonly, it’s the root shell, also known as the superuser.

Here’s where it gets a bit technical. sudo utilizes the setuid (set user ID upon execution) bit in Unix-like operating systems. When a user tries to execute a setuid binary like sudo, the system temporarily elevates the user’s permissions. This lets sudo access files and execute commands that a standard user normally can’t.

One super cool thing is the grace period feature. sudo won’t nag you for your password with every command if you’ve recently authenticated. This is achieved using ’timestamps,’ little files that get created to vouch for you. However, the security-conscious among us can disable this feature, making sudo prompt for a password every time.

Another thing you might not know is that sudo keeps logs, which you can check out using sudo tail /var/log/auth.log or sudo journalctl -xe, depending on your system. This ensures accountability, making sure there’s a trail of breadcrumbs leading back to any changes made on the system. This isn’t just good practice; it’s a security necessity. Remember, sudo isn’t a cloak of invisibility; it’s more like a traceable license to drive.

So in a nutshell, sudo is a beautifully complex tool that juggles permission levels, consults configuration files, initiates new shells, and even keeps tabs on what you’re doing. And it does all this while making it look easy. Phew! It’s like the circus performer of the Unix world, and boy, does it deserve a standing ovation!

Common Use Cases and Examples

Alright, tech enthusiasts, now that you’ve had your fill of the “why” and “how” behind sudo, let’s get down to the fun stuff: actual examples and scenarios where you’d use this powerful command.

Software Installation and Updates

First off, the bread and butter for most casual users is software installation and updates. In a Debian-based system like Ubuntu, you’d run ‘sudo apt update && sudo apt upgrade’. This updates the package list and upgrades all your installed software. Super simple, but super effective.

File Permissions

Now, what if you’re brave (or foolish) enough to delete a system file? Normally, I’d say, “Don’t do it!” But if you must, you’d type ‘sudo rm /path/to/your/file’. Just remember, you’re playing with fire here!

User Management

For the sysadmins in the room, user management becomes a breeze with sudo. Want to add a user? Just run ‘sudo adduser john’, and you’ve got yourself a new John in the system.


Experiencing network issues? A quick ‘sudo systemctl restart networking’ will reboot your network services and hopefully resolve your problems.

Debugging and System Monitoring

Now, for the Sherlock Holmes among us who enjoy a good debugging session, sudo is invaluable. You can use ‘sudo strace -p [PID]’ to latch onto a running process and snoop on the system calls it’s making.

Custom Sudo Commands

Okay, level-up time! You can also cook up your own custom commands by tinkering with the /etc/sudoers file. This lets you set very specific permissions for users and commands, giving you fine-grained control over your system.

The Sudoers File

And speaking of the /etc/sudoers file, this is the Holy Grail of sudo. It’s where you can set all sorts of permissions and essentially dictate who can do what on your system. It’s advanced but super empowering once you get the hang of it.

So, there you have it—real-world applications of sudo, from simple software updates to advanced user management and system monitoring. Mastering sudo is like getting a VIP pass to your system, letting you make the most out of its capabilities. Just remember: With great power comes great responsibility. Handle with care!

Sudo Best Practices

Let’s talk real talk—sudo is a beast of a command. But if you’re not careful, you can turn that beast into a runaway train real quick. So here are some best practices to ensure that your sudo experience is more smooth sailing than a roller coaster ride.

Limit Access

First things first, not everyone should have sudo access. Seriously, you wouldn’t give everyone the keys to your house, right? Customize your /etc/sudoers file to make sure only trusted users can run specific commands. The more granular, the better.

Use Strong Passwords

Come on, folks, “password123” just won’t cut it. Using strong, unique passwords is like putting an extra lock on your door. It might seem tedious, but it’s a small price to pay for security.

Enable Two-Factor Authentication (2FA)

Take your security game up a notch by enabling two-factor authentication. It’s like having a guard dog alongside that extra lock on your door. It might seem over the top, but when it comes to security, there’s no such thing as ’too much.’

Keep Logs and Audit Frequently

Remember how sudo keeps logs? Make use of them. Regularly check the logs to see who’s doing what. If you notice something fishy, you can trace it back to the user and the command they executed. It’s like having security cameras inside your system.

Use Timeouts

By default, sudo gives you a 5-minute grace period after entering your password. But if you’re super security-conscious, you can tweak this setting. A shorter timeout means you have to enter your password more often, but it also lessens the window for potential mischief.

Think Twice, Type Once

And last but definitely not least, always think twice before you hit that Enter key. The power of sudo is both its strength and its weakness. A single command can either fix your system or break it beyond repair. So tread carefully, young Padawan.

At the end of the day, sudo is an incredibly powerful tool, but it’s not a toy. Use it wisely, and it’ll serve you well. Abuse it, and well, let’s just say you’re in for some long nights of debugging and hair-pulling.

So there you have it—the do’s and don’ts of sudo. May your journey be devoid of “Permission Denied” errors and full of superuser glory!

Sudo Alternatives: Because Choices Are Good

Look, sudo is like the LeBron James of privilege escalation—versatile, dependable, and freakishly good at what it does. But hey, even LeBron has teammates, and in the Linux world, sudo has its alternatives.

su: The Original Gangster

Before there was sudo, there was su, which stands for “substitute user.” This command switches you to another user account, and if you’re feeling bold, that could be the root account. Unlike sudo, it doesn’t have a configuration file to limit permissions, so it’s an all-or-nothing deal. Use ‘su - username’ to switch users, but be aware: once you’re in, you’re in. No takesies backsies!

doas: The Minimalist

This one’s for the folks who like their code like they like their coffee—strong and simple. doas is a lightweight alternative that does many of the same things sudo does but without the extra frills. Just type ‘doas command’, and you’re golden.

pkexec: The GUI Lover

If you’re more of a point-and-click kind of person, pkexec might be up your alley. It’s part of the Polkit framework and gives you a pretty graphical interface to work with. It’s not as powerful or flexible as sudo, but hey, it looks good doing what it does.

Superuser Apps for Android

Oh yeah, for those who love to tinker with their Android devices, apps like SuperSU or Magisk allow for superuser access on Android. It’s a whole different ballgame but still rooted (pun intended!) in the same principle of privileged access.

Cloud-based Solutions

In enterprise environments, cloud-based solutions like AWS Identity and Access Management (IAM) or Azure Active Directory often replace traditional methods like sudo. These platforms offer a more centralized and scalable approach, especially useful in complex infrastructures.

Why Not Just Use Sudo?

With all these options, you might be wondering, “Why not just stick with sudo?” Well, the truth is, most people do. But it’s always good to know your options. Each alternative has its unique advantages and use-cases, and who knows, one of them might just fit your needs better than sudo.

So while sudo might be the star player, it’s not the only one on the team. Whether you’re a minimalist, a GUI aficionado, or someone managing an enterprise-level system, there’s a privilege escalation tool out there for you. Pick your poison wisely!

Common Pitfalls and How to Avoid Them

Listen up, because this is where we talk about the dragons lurking in the dark corners of your terminal window. sudo is fantastic, but it can be a double-edged sword if you’re not careful. So let’s dive into some of the common pitfalls and, more importantly, how to dodge them like Neo in ‘The Matrix.’

Running Commands Blindly

Ever copy-pasted a command from the internet without fully understanding what it does? Yeah, we’ve all been there. But when you prefix that mysterious command with sudo, things can get messy, fast. Always understand what you’re running and why. A bad sudo command can mess things up quicker than you can say “system restore.”

Overusing Sudo

Look, just because you can run any command as a superuser doesn’t mean you should. Using sudo for trivial tasks is overkill and can lead to unintended consequences. So unless absolutely necessary, keep the sudo in its sheath.

Misconfiguring Sudoers File

Ah, the mighty /etc/sudoers file. Tinker with it carelessly, and you could lock yourself out of your own system. Always use the visudo command to edit this file, as it checks for errors before saving. It’s your safety net—use it.

Ignoring Software Updates

Outdated software is a security risk, plain and simple. Keeping your system up to date is good practice in general, but it’s especially crucial for a command as powerful as sudo. Run regular updates, and keep an eye out for security patches.

Not Checking Logs

Those logs aren’t just for decoration; they’re a treasure trove of information. If something goes wrong—or even if it doesn’t—it’s always a good idea to regularly check your logs. It’s like checking your bank statements: you might not always like what you see, but you need to know what’s going on.

So there you have it—some of the common pitfalls that can turn your sudo experience from a dream into a nightmare. Avoid these traps, and you’ll be well on your way to becoming a sudo samurai, skillfully wielding this powerful command with both might and wisdom. Just remember, a wise samurai never goes into battle without knowing the lay of the land.

The Culture of Sudo: More Than Just a Command

Alright, time for a culture dive. Believe it or not, sudo is more than just a command you type into a terminal; it’s a part of the broader tech and open-source culture. It’s like the secret handshake you need to know to be a part of the cool kids’ Linux club.

The Sandwich Meme

You might have heard the famous joke, ‘sudo make me a sandwich.’ Based on an XKCD comic, this line has become an emblem of sudo’s power and a bit of geek humor. The idea is that even if someone refuses to do something, slapping a sudo on the command will make it happen. It’s funny but also indicative of the authority the command holds.

Open Source Communities

sudo is widely celebrated in open-source communities. Being an open-source project itself, it embodies the collaborative spirit that makes Linux and other FOSS (Free and Open Source Software) projects so unique and powerful.

Enterprise Culture

In corporate settings, sudo is often the unsung hero. It helps maintain a secure environment by limiting user access, making it a staple in any sysadmin’s toolkit. However, it’s often replaced or supplemented by more complex identity and access management solutions in larger organizations.


In the DevOps world, sudo is often part of automation scripts and deployment processes. The use of sudo can be crucial in continuous integration and deployment pipelines, making it as relevant for modern DevOps practices as it is for traditional system administration.

Hacker Culture

Interestingly, sudo also has its darker implications. Its power makes it a target for exploits and hacking attempts, often featuring in the storylines of hacker movies and TV shows. But remember, the more you know about its inner workings, the better you can secure your system.

So, while sudo might seem like just another command, it’s deeply ingrained in the fabric of tech culture. Whether you’re an open-source enthusiast, a corporate sysadmin, or even a DevOps guru, sudo is a term that brings a nod of recognition and a sense of community.

Future of Sudo: Beyond the Horizon

Alright, let’s dig a little deeper into the crystal ball. sudo has had a long journey since its birth in the ’80s, and it’s still a major player. But what does the future hold?

A Focus on User Experience

Believe it or not, even command-line tools are starting to pay attention to user experience. We might see sudo offering more user-friendly error messages or even a “help” feature that goes beyond the typical man pages. Why? Because no one likes cryptic error messages, that’s why.

Integration with Machine Learning

Sounds futuristic, doesn’t it? Well, the buzz in the tech forums is that machine learning algorithms could be used to detect abnormal command-line behaviors in real-time. Imagine sudo automatically flagging or blocking unusual activity based on learned user behavior. That’s some next-level stuff!

Environment-Specific Customization

As sudo gets used in increasingly diverse environments—from IoT devices to massive cloud-based systems—there’s a growing need for context-aware configurations. In the future, we might see sudo offering environment-specific customization options straight out of the box.

Web-Based Management Dashboard

While sudo has always been a command-line tool, there’s talk about the possibility of a web-based dashboard for managing sudo across multiple machines. This would be a godsend for sysadmins dealing with complex networks and would provide a centralized hub for sudo settings and audit logs.

Greater Ecosystem Synergy

Expect to see sudo becoming more tightly integrated with other Linux utilities and even non-Linux systems. Given the rise of cross-platform solutions and containerization technologies like Docker, the ability of sudo to play nicely with others will be increasingly crucial.

Community-Centric Development

The best part about open-source projects like sudo is that they’re continually shaped by community feedback. Whether it’s GitHub discussions, user surveys, or dedicated forums, expect the voice of the user to be a significant driving factor in shaping newer versions of sudo.

So, even though sudo is an oldie, it’s still very much a goodie—with a ton of potential for innovation and enhancement. The command may be simple, but its implications are vast and ever-changing. As they say, the only constant is change, and sudo seems more than ready for the ride.

Frequently Asked Questions (FAQs) About Sudo

Okay, time to tackle some of the most-asked, head-scratching, “um, what now?” questions about sudo. Trust me, if you’ve got a question, someone else has probably asked it before.

What’s the Difference Between sudo and su?

Ah, the age-old debate. While both sudo and su can give you superuser powers, they do it in different ways. su switches you to the root user (or any other user), while sudo allows you to execute specific commands as another user. Think of su as moving into a new house, while sudo is like housesitting for a friend.

Why Do I Need to Type My Password So Often?

Well, for security, duh! But seriously, sudo has a default timeout (usually 5 minutes). After the time elapses, you’ll need to re-enter your password. It’s a bit like your phone locking after you haven’t used it for a while.

Can I Execute Multiple Commands with Sudo?

Absolutely, you can chain commands using ‘&&’ or ‘;’. For example, you’d type ‘sudo apt update && sudo apt upgrade’ to update the package list and then upgrade all packages.

What Does sudo !! Do?

This is one of those cool shortcuts. If you forgot to use sudo on your last command, just type ‘sudo !!’, and it will execute the last command you entered but with sudo privileges. It’s like a do-over button.

How Do I Know Which Commands Require sudo?

Generally, any command that makes system-wide changes will require sudo. Also, commands that access protected files or perform tasks like mounting and unmounting drives often need the superuser mojo.

Can I Mess Up My System with sudo?

In one word: Yes. sudo is a powerful tool, and with great power comes great responsibility. One wrong command can lead to data loss or a non-functional system. Always double-check your commands and understand their impact.

Can I Customize sudo?

Oh, you bet! The /etc/sudoers file is your playground for customizing who can use sudo and for what. You can set permissions, create aliases, and even specify which commands certain users can execute.

So there you have it—quick answers to some not-so-simple questions. If you ever find yourself stumped while playing in the Linux sandbox, chances are someone else has faced the same conundrum. And if all else fails, just remember: Google is your friend!

Conclusion: Mastering Sudo, One Command at a Time

So here we are, at the end of our sudo-journey, and what a ride it’s been! From its roots as a simple Unix command to its stature as a cultural icon in the tech world, sudo stands as a testament to the enduring power of well-designed software. It might just be a command-line utility, but as we’ve seen, it packs a wallop.

Use It, Don’t Abuse It

Remember, with great power comes great responsibility. The same sudo that can streamline your admin tasks can also wipe out your system with a misstep. Always double, heck, triple-check your commands. And if in doubt, consult the manual or trusted forums. The sudo command is your toolkit for administrative freedom, but it’s not a toy. Use it wisely.

Stay Updated, Stay Secure

Security threats are ever-evolving, and so is sudo. The developers and the community are hard at work to make sudo safer, more efficient, and more adaptable to modern computing needs. Keep your system and sudo up to date to benefit from the latest security patches and features.

The Community is Your Playground

Whether you’re a newbie just starting out or a seasoned sysadmin, there’s always something new to learn. Don’t hesitate to contribute to forums, read blogs, and participate in discussions. Your unique insights and challenges make the sudo community richer.

What’s Next?

The future of sudo is as exciting as it is uncertain. With potential advancements in security features, scalability options, and even machine learning integrations, who knows what sudo will look like 10 years from now? But one thing is clear: as long as there are systems to manage and commands to run, sudo will be there, front and center.

References and Further Reading

  1. Sudo Man Page - Because you can never go wrong with the basics.
  2. Sudoers File Explained - A detailed guide by DigitalOcean.
  3. The History of Sudo - For the history buffs out there. your sudo environment.

So, go ahead. Make that sandwich, but also make the most out of sudo. Until next time, happy sudoing!

Interesting Facts About Sudo: Bet You Didn’t Know!

Who doesn’t love a good fact dump? Let’s spice things up with some trivia and fascinating tidbits about sudo. Brace yourself for some geeky fun!

  1. Origins: The sudo command was first developed in 1980 at the Department of Computer Science at SUNY/Buffalo by Bob Coggeshall and Cliff Spencer.

  2. The Name: ‘Sudo’ actually stands for “SuperUser DO”.

  3. XKCD Fame: The sudo make me a sandwich joke comes from an XKCD comic.

  4. Cultural Impact: Sudo has its own annual day, July 20, thanks to SysAdminDay.

  5. Sudo Song: Yes, there is a song dedicated to sudo. It’s called “Sudo Modprobe”.

  6. Multiple Platforms: Originally Unix-based, sudo has been ported to run on macOS and even Windows Subsystem for Linux (WSL).

  7. Insults Feature: If enabled, sudo can insult you for typing the wrong password. It’s a compile-time option!

  8. File Integrity: Sudo uses a timestamp file to prevent repeated password prompts, which is more secure than you might think.

  9. No Root Required: Despite popular belief, sudo can execute commands as any user, not just the root.

  10. Adaptable Authentication: sudo can be configured to use various forms of authentication, not just passwords.

  11. Logging: All sudo activities are logged, and this can be configured to alert the system admin in real-time.

  12. Non-Commands: Sudo can also be used to edit files with sudoedit which invokes the default text editor with superuser permissions.

  13. Time Span: You can actually specify for how long sudo will remember your authentication before asking for your password again.

  14. International Fame: sudo has been translated into multiple languages, including French and even Latin!

  15. Alias Usage: sudo supports command aliases for groups of commands, which can make life way easier for sysadmins.

  16. Security Awards: The sudo project has won several awards for its security practices.

  17. Regular Updates: Believe it or not, the sudo project is still very actively maintained, with updates released multiple times a year.

  18. Password Caching: sudo has smart password caching to prevent unnecessary password prompts when running multiple commands.

  19. Configurable: You can add custom security policies through the plug-in architecture of sudo.

  20. Tab Completion: Many people don’t know that tab completion works even when you’re typing a command

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