Apple OSX come fare il boot in verbose mode (tipo ms-dos)

[Max Brezzi]

Articolo copiato da qui: http://www.idownloadblog.com/2015/08/17/how-to-boot-your-mac-in-verbose-mode/



Enter OS X's Verbose Mode.

Not only does Verbose Mode makes it easy to access detailed status messages as your Mac is starting up, but also lets you see what's really going on behind the scenes and watch as OS X loads kernel extensions and other startup items.

In this tutorial, we're going to cover booting your Mac in OS X's Verbose Mode, explain in which situations it might come in handy and give you some handy tips related to using Verbose Mode.

What is Verbose Mode?
Verbose Mode is like normal booting mode, with one exception: instead of watching the progress bar filling or the spinning indicator spinning, it gives you peek under the hood and see the output of what's happening every time the system starts up.

As such, Verbose Mode is useful for troubleshooting software issues you may be experiencing with OS X or third-party apps. It's also indispensable for software development.

How to boot in Verbose Mode
To startup your Mac in Verbose Mode, follow these simple steps:

Step 1: If your Mac is on, turn it off by choosing Shut Down in the Apple menu.

Step 1: Now press the power button to start your Mac.

Step 1: Right upon hearing the startup chime, press and hold the Command (⌘) – V key combination for Verbose Mode.

You'll know that you have successfully entered Verbose Mode when you see white text appear on the screen as if you were in the MS-DOS text mode from the 1980's, as depicted on the screenshot at the top of the post.

You will automatically exit Verbose Mode when the Mac's startup process progresses sufficiently and the OS X login screen or desktop appears.

Tip: If your Mac does not progress beyond Verbose Mode, just press the power button until it shuts down. If your Mac is connected to a faulty external keyboard causing it to detect a wrong key press during boot, unplug the keyboard when booting, use your Mac notebook's built-in keyboard, or hook up another wired or wireless keyboard.

How to always boot in Verbose Mode
Normally, hitting Command (⌘) – V starts up your Mac in Verbose Mode until next restart.

Making OS X always boot into Verbose Mode involves a little bit of Terminal trickery to adjust your Mac's firmware with the 'nvram' command.

Step 1: Navigate to your Mac's Applications > Utilities folder and open the Terminal application. Alternatively, click the Spotlight icon in the menu bar and search for 'terminal'.

Step 1: Type the following command into the Terminal window and hit Return. You might need to provide your Mac's administrator password.

Codice Seleziona Espandi

sudo nvram boot-args="-v"

Executing this command will ensure that every system boot from now on is in Verbose Mode, whether you invoke it manually upon hearing the startup chime or not.

Step 3: To disable automatic booting in Verbose Mode, execute the following command in Terminal:

Codice Seleziona Espandi

sudo nvram boot-args=""

Now OS X will start up normally at each booth unless of course you hit the modifier keys immediately upon hearing the system's boot chimes.

Tip: Using Terminal can be a nice shortcut for starting up a remote Mac in Verbose Mode, especially if it doesn't have a keyboard attached to it. Just log into a remote Mac using SSH and execute the aforementioned Terminal command.

Things your Mac does in Verbose Mode
Verbose Mode is no different than OS X's normal booting mode.

In a nutshell, Verbose Mode replaces the startup graphics with a text-only mode to show you everything the computer is doing during the boot process. All Startup Items and Login Items are loaded normally in Verbose Mode, as are required kernel extensions, user-installed fonts, drivers and so forth.

When to boot in Verbose Mode
Some of the situations that warrant booting into Verbose Mode include:

If you're a developer—If you develop software for a living, you'll want to boot into Verbose Mode to troubleshoot issues with your app.
If you have startup issues—Sometimes your Mac may crash during startup and Verbose Mode is one way to troubleshoot a startup issue. In fact, Verbose Mode is especially useful when used in conjunction with OS X's Safe Mode booting.
If you have custom hardware setup—People who hook up specialized peripherals to their Mac, like DJ decks, Thunderbolt drives, digitizers and so forth can identify problems in Verbose Mode by checking out the messages to see if software support for your peripheral has loaded successfully.
If you're curious—As mentioned before, Verbose Mode lets you peek behind the scenes and see what exactly is going on during the OS X booting process.
Again, as no feature is disable or crippled in Verbose Mode, feel free to use it without fearing that booting in this mode will limit what you can do on your Mac.

Still having issues?
If you're having issues entering Verbose Mode, or it's not helping fix issues your Mac may be exhibiting, try the following:

I cannot enter Verbose Mode—You will not be able to use Verbose Mode if the Mac owner or administrator has enabled Open Firmware Password Protection.
Verbose Mode didn't solve my issue—Your next best bet is Safe Mode. Learn how, when and why you should use OS X's Safe Mode in this how-to. Booting your Mac in Safe Mode loads only essential OS X items, helping isolate any software problems you might have.
Because Startup Items and Login Items are disabled in Safe Mode and certain features are turned off, such as native display drivers, advanced Wi-Fi and file sharing, some apps might not work correctly in Safe Mode.

[Max Brezzi]

http://osxdaily.com/2007/03/25/always-boot-mac-os-x-in-verbose-mode/



How to Always Boot Mac OS X in Verbose Mode
Mar 25, 2007 - 27 Comments
Finder Booting Mac OS X as usual shows the Apple logo and eventually you'll wind up at a login screen or desktop, that's attractive and all, but some users would prefer to see what's going on behind the scenes. That's what Verbose Boot Mode does, it shows you what is really happening during system startup on a Mac, and is great for troubleshooting purposes, but it can also just be interesting to see what exactly is going on during the OS X booting process.

Typically, if you wanted to boot in verbose mode on a per boot basis you would hit Command-V during startup, which brings up the familiar white on black console looking screen with a lot of scrolling text. On the other hand, some users may prefer to always see the complete verbose booting process on every boot including all kernel extension loading, details, and system messages on boot, and to do that you can adjust the firmware from the Terminal with the nvram command, as we'll cover here.


Turn On Always Verbose Booting for OS X
Simply execute the following nvram command at the Terminal to enable verbose boot mode and set it to 'always' (meaning every system boot is verbose by default):
sudo nvram boot-args="-v"

Disabling Verbose Booting on the Mac
Equally simple is the ability to disable verbose booting, which will basically make OS X boot as normal – this is the default boot behavior of every Mac:
sudo nvram boot-args=

Check current nvram firmware boot settings
If you're curious what the current firmware nvram settings are, type the following:
nvram -p

That will show you the current nvram parameters, indicating if something like verbose mode or safe boot is enabled, but you'll also see some other data there too that may appear as gibberish – for our purposes here you can ignore all that and just focus on the boot arguments.

What is Verbose Boot Mode?
Verbose boot mode is helpful when troubleshooting your Mac, particularly when used in conjunction with OS X safe booting. It allows you to see everything your Mac is doing on system boot, so if there is an error thrown or something going wrong during the system boot process, it's easier to identify. It's a text only boot mode, but it will be exited from automatically when the Mac OS X boot process has completed enough to enter into the graphical user interface. This is what it looks like roughly to boot OS X with verbose option enabled:

verbose-boot-mac-os-x

Most users will have no need to boot verbose, unless out of curiosity, or performing some particularly complex troubleshooting or diagnostics tasks on a Mac. Nonetheless, it can be an interesting trick to see what's going on, and in many ways it resembles looking at a Terminal screen or booting a Linux PC as the kernel details scroll by during the loading process.