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Remove 'warning! Mac os is infected' virus related Safari extensions: Open Safari browser, from the menu bar, select ' Safari ' and click ' Preferences.' In the preferences window, select ' Extensions ' and look for any recently-installed suspicious extensions. When located, click the ' Uninstall ' button next to. I have a DNS and DHCP server (Linux machine) managing my LAN addresses and names. Everything is configured and fully working once the clients are up and running, having every Mac OS X client a DHCP given IP in the private class 192.168.1.x as given by the DHCP server.

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1. Everything Is a File

If you're a casual Mac user, or even if you're a hard-core Linux or Unix user, there are a few things about Mac OS X and the particular flavor of Unix under its candylike shell that might catch you off guard. Files and folders behave in rather different ways when you're addressing them with textual commands than when you're shoving them around with your mouse. Not only do they look different, they act different, too. You might even say they 'think different.'

The shell, which is what we call the command-line environment displayed by the Terminal application, is an austere and cryptic piece of software—about as un-Mac-like as it can possibly get. By the end of this book, you'll have found all kinds of uses for it—tricks that weren't otherwise possible using the graphical Aqua interface. But there's a steep learning curve, particularly for readers who have never dabbled in Unix before, and there are a few things you're going to have to know about how your files work in the shell before you can really start ordering them around.

Everything Is a File

Your Mac is designed primarily to show you your documents, folders, applications, and other items in neatly ordered windows, with pretty icons next to them to help you differentiate them based on their type. You can open Finder windows that show you each item's Kind in a column, distinguishing your Photoshop images from your Word documents and your folders and applications. Mac OS X even has 'bundles,' which are special folders full of executables and other items masquerading as single monolithic files in the Finder, which you'll learn more about in Chapter 5, 'Using the Finder.' At the graphical level, your Mac is full of all kinds of items that each get their own unique look and descriptive vocabulary.

Not much of that matters at the command-line level. Your shell doesn't see a folder differently from how it sees a Word document; they're both just 'streams of bits with names' as far as it's concerned, and in its 1970s-era worldview that's all that matters. The only thing distinguishing a folder (or directory) from a file is that the bits in it describe links to other files that the operating system should interpret as part of that folder, rather than the binary or textual data stream that make up a file's contents—but to Unix that's trivia. If you use the ls ('list') command in the shell to list the files in a folder, you'll just get a list of names—no icons, no turn-down arrows, no clues to help tell you that some of the things you're looking at are files and some are folders, applications, or what-have-you. (There are some options you can give to the ls command to make it smarter about how it lists the items, as you'll see later; but that's a courtesy that Unix only grudgingly grants.)

In the Unix world, everything's a file, including such oddities as running processes and network connections and attached devices, and you interact with them all in pretty much the same way, using the same commands for everything (with a few exceptions, like the mkdir command). I point this out to make you aware that if you see the command-line examples in this book refer to 'files,' it means 'files, folders, and any other discrete pieces of data.' If a command makes a distinction between regular data files and other kinds of items, I'll say so; but otherwise, you can generally expect that a command will work the same on one kind of item as on another, because it'll see 'files' with as little discrimination as Unix does.

Does your Mac go to sleep when you are downloading a file or backing it up? Do you want to keep your Mac from sleeping? Okay, there are three easy ways to do so. The first one is using the energy-saver feature, second is to use the terminal, and the third is using a third-party app. All of these methods are straightforward. So, let us dig right in and see how to stop your Mac from sleeping.

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Prevent Your Mac from Sleeping Using Energy Saver

1. Click on the Apple logo from top-right → Click on System Preferences.
2. Click on Energy Saver.Note: If you are on a MacBook, you will see two tabs here: Battery and Power Adapter. You can follow steps 3 and 4 below for both Battery power and while your MacBook is charging.
3. Drag the Turn display off after slider to Never → Select Ok from the popup.
4. Next, tick the box for Prevent computer from sleeping automatically when the display is off.

Now, your Mac will not go to sleep. If you wish to turn off this feature, follow the above steps, and drag the slider to the left and set the time according to your preference. Now, you Mac will sleep after the set period of inactivity.

RELATED: How to Keep MacBook from Sleeping With Lid Closed

Prevent Mac From Sleeping Using Terminal App

1. Go to Applications folder → Utilities → and open Terminal.Or press Command (⌘) + Space Bar to open Spotlight Search and type Terminal.
2. Type one of the following Terminal commands according to your preference and hit the enter

• caffeinate -d To prevent the display from sleeping
• caffeinate -i To prevent the system from idle sleeping
• caffeinate -m To prevent the disk from going idle
• caffeinate -s Keep the Mac awake while it is plugged into AC power
• caffeinate Now, your Mac will stay awake for as long as you leave the Terminal running. To stop this, use the keyboard shortcut Ctrl+C
• caffeinate -t 1800 & Here 1800 is the time in seconds. You can set it to anything. Now your Mac will stay awake for this time duration

The above commands run as long as you leave the Terminal app running.

Using Third-party Apps

1. Download Amphetamine from the Mac App Store.
2. Open the app and click on Next. You can read and click Next on all subsequent screens to learn more about this app.
3. Click on two half-circle icon (that looks like a pill) from the top menu bar.
4. Click on Indefinitely. Now you Mac will never sleep.
5. Now, Click on the Amphetamine app icon from the top menu bar and then click on End Current Session.

Other Apps That Prevent Your Mac From Sleeping

Amphetamine is potent (and popular). However, your choices are not limited. Some other great apps that keep your Mac from sleeping are:

That’s all, mate!

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Signing off…

These were the easy ways to keep your macOS device from sleeping. Now you can peacefully continue to download big files, backup the Mac, or prevent the screen from dimming when you are not watching a video in full screen. I hope this tutorial was helpful, and you learned something new.

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Which method are you going to use? System Preferences, any App, or Terminal? Please share your thoughts with us in the comments down below.