HEAD MODE Mac OS

adminMay 25 2021

HEAD MODE Mac OS

Mac’s Classic OS continues to fade in compatibility and relevance, with support in crucial areas – especially Web browsers and email software – becoming more and more tenuous. Classic Mode is not supported in Mac OS X 10.5 Leopard on any Macs and was never supported on Intel Macs.

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Personally, I still [2008] use Classic Mode on my PowerBooks running OS X 10.4 Tiger to support a handful of applications I’ve never found completely satisfactory OS X substitutes for, and I use it daily on my “utility” Pismo PowerBook. Our old 233 MHz G3 Series WallStreet PowerBook doesn’t get much use any more, but it runs very nicely in Mac OS 9.2.2, and I’m glad have the good, old Classic Mac OS available as a bootable standby even on our G3 iBook and G4-upgraded Pismo PowerBooks, although I very rarely boot into it. When I do, I’m always gratified by the speed and responsiveness compared with OS X, but I do miss the OS X feature set, especially preemptive multitasking, Spotlight, and Spaces.

Dark Mode is a dramatic new look that's easy on your eyes and helps you focus on your work. Dark Mode uses a dark color scheme that works system wide, including with the apps that come with your Mac. And third-party apps can adopt it, too.

Fast and Responsive on Old Macs

However, if you have an older Mac that is not supported by OS X or some of the slower G3 machines (like the WallStreet, which officially supports up to OS X 10.2.8 Jaguar), there is still a strong case to be made for running OS 9 – and there are also certain software applications that are only supported in OS 8/9 that may be mission critical for some users.

Recovery Mode was launched in the year 2010 with the release of OS X 10.7 Lion to let users play geeky when their Mac needs it most. Let’s walk through this step-by-step guide to start your Mac in recovery mode.
Apple has offered a Safe Boot option ever since OS X Jaguar (10.2). Safe Boot can be a crucial troubleshooting step when you're having problems with your Mac.These can be problems with starting up your Mac or issues you come across while using your Mac, such as having apps not start or apps that seem to cause your Mac to freeze, crash, or shut down.
Your Mac computer is set to go to sleep after a certain amount of time in order to help conserve power or your laptop’s batteries. However, it can be annoying if your computer is going to sleep when you don’t want it to. Here’s how to turn off sleep mode on a Mac using System Preferences and keep it awake with third-party apps.

Mac OS 9.2.2 is fast, responsive, and rock-stable on my old PowerBooks and iBook. I once went for more than three months on the WallStreet without rebooting. That’s in 2-3 hours of daily use, and I got up to nearly “Untitled 700” in Tex-Edit Plus documents before I finally had to restart to satisfy a software installer.

No Up-to-Date Browsers

Unfortunately, the most significant drawback to using OS 9 on an Internet-connected computer these days is the lack of any really up-to-date and satisfactory web browser. The most contemporary option is iCab 3, which was last updated on January 1, 2008, but iCab 4 is not being developed for Classic, so the writing is on the wall even there. Other alternatives are Netscape 7.x and Mozilla 1.2.1 (and it’s WaMCom variant).

UPDATE: Although every mainstream browser left the Classic Mac OS behind, Classilla has come to its rescue. Launched in mid 2009, Classilla is built around Mozilla and its Gecko rendering engine – all ported to PowerPC Macs, primarily by Cameron Kaiser. Classilla, a portmanteau of Classic and Mozilla, supports Mac OS 8.6 through 9.2.2. Versions 9.0 through 9.2.2 worked like regular browsers, but with version 9.3 the app reports itself as a mobile browser for access to more lightweight versions of websites.

Special Considerations

There are a couple Macs that require a special version of Mac OS 9.2.2. If you try to run the standard version on these models, they will be missing some crucial ingredients. The Early 2003 iBook G3 (12″ and 14″), 867 MHz and 1 GHz Late 2002 Titanium PowerBook G4, 2003 eMac, Quicksilver 2002 Power Mac G4, and MDD Power Mac G4 (the model without FireWire 800) require a machine-specific version of OS 9.2.2.

OS 9 Installation & Updates

Whether you really can get along without the ability to boot directly into the Classic OS is an important point to consider these days when planning a system upgrade, and Intel Macs don’t support Classic Mode at all.

Apple has posted a handy table, Mac OS 8 and 9 Compatibility with Macintosh Computers, detailing which Mac models – from the 68040 Centris machines of the early 90s through the 2004 aluminum PowerBooks – are supported (or not) by the Classic Mac OS versions 8.0 through 9.2.2. It’s worth a look if you have questions about what OS versions your machine can handle. All G3 Macs and most G4 models can run Mac OS 9.2.2.

For example, Apple’s chart shows that my late-in-the-production-run Pismo PowerBook will support Mac OS 9.1 through 9.2.2, while my four-year-old 700 MHz iBook can only boot into OS 9.2.2 (and, of course, OS X).

System requirements for OS 9 are a Mac or compatible clone that shipped with a Power PC processor and has an optical drive, 40 MB of RAM (32 MB of RAM set to 40 MB virtual memory qualifies), and 150 to 400 MB of hard drive space, depending on installation options. 680×0-based Macs with PowerPC upgrades cannot install Mac OS 9.

Apple has also posted a Knowledge Base article, Mac OS 9: Available Updates, describing the updates available for Mac OS 9 – and the order in which they must be installed. You must install all prerequisite software before installing any update. For example, when updating Mac OS 9.0 to Mac OS 9.2.2 the updates must be installed in this order:

Mac OS 9.1 Update for OS 9.0 through 9.0.4
Mac OS 9.2.1 Update for OS 9.1 or 9.2
Mac OS 9.2.2 Update for OS 9.2.1 only

Note that the free downloadable Mac OS 9.1 Update contains fewer updates and extras than the Mac OS 9.1 CD-ROM disc. This reduces the amount of data that must be downloaded at once.

The downloadable update contains core system software updates, Apple Remote Access (ARA) Client Server 4.0, and QuickTime 4.1.3. The Mac OS 9.1 download may only be used to update a computer that has Mac OS 9.0.x installed. It is available from Apple Software Updates.

The Mac OS 9.1 disc includes additional updates to the Mac OS that are not a part of the downloadable Mac OS 9.1 Update. Some of these additional items are available separately at Apple Software Updates or from third-party websites (non-Apple software). The disc may be used for full installation or clean installation. Apple details differences between the download and the CD in Mac OS 9.1: Downloadable Update versus Mac OS 9.1 Disc.

Also note that upgrading the NuBus motherboard architecture Power Macs (the 6100, 7100, 8100, and related models) to Mac OS 9.1 requires a Mac OS 9.1 Full Install CD, as Apple did not support these oldest Mac OS 9 compatible Macs with its free updaters. For more information on this see Mac OS 9.1: Start Up from CD to Install on Original Power Macintosh Computers.

Another caveat: Your Mac must have the appropriate Mac OS ROM file for the version of the Mac OS that is installed. Using the wrong Mac OS ROM file can cause the computer to behave unpredictably and may even prevent it from starting up. This information should be found on each model’s profile page on LowEndMac.com.

Apple has posted a chart, Mac OS: Matching Mac OS ROM File to Mac OS Version, showing the applicable Mac OS ROM file for the applicable Mac OS version.

Apple recommends: “You should use the latest version of Mac OS 9 [that your hardware supports].” Pre-G3 Macs only support up to OS 9.1. IMHO, this is no major hardship in most instances, as there are a very few applications that require Mac OS 9.2.2.

OS 9 Helper

Mac OS 9.1 is the final version that Apple allows to install on anything previous to the Beige G3. However, there is an installer patch hack, OS 9 Helper, that allows you to install 9.2.1 or 9.2.2 on certain “Old World” Macs that Apple dropped support for.

OS 9 Forever says that the performance improvements added in 9.2.x are clearly noticeable once you install it. In particular, the Finder is incredibly responsive, and Open Transport networking is vastly more stable. However, the four most important reasons for installing 9.2.x are:

Compatibility with ATI’s latest drivers. ATI dropped support for OpenGL versions lower than 1.2.2. (9.1 has 1.2.1).
You can’t run DVD Studio Pro 1.2.1 or 1.5 without 9.2.2.
You can’t run Final Cut Pro 3 without 9.2.2.
Full compatibility with first- and second-generation iPods.

The hack works with all of the “PowerSurge” models, including the 7300, 7500, 7600, 8500, 8600, 9500, and 9600. The 6500 seems to work as well. The hack also works on the PowerBook 1400, 2400, 3400, and Kanga PowerBook G3, but not on the PowerBook 5300.

The NuBus Power Macs (6100, 7100, 8100 series, and the Duo 2300) have only been a limited success using OS 9 Helper, and the Power Mac 4400 and Motorola StarMax Mac clones are not supported.

Classic Mode

Every version of Mac OS X through 10.4 Tiger supports the classic environment, which allows you to run Mac OS 9.x within Mac OS X. Compatibility is excellent, and if you have a dual-processor Power Mac G4 or G5, you’ll see top notch performance. That’s because the way Classic Mode works is that it enables the processor to dedicate as many resources as necessary to the Classic Mac OS – but only a single processor. That can really tie things up on a single-processor Mac, but on a dual-processor machine, the second processor is free to do all the other work, keeping you productive even when OS 9 has completely taken over the other CPU.

In fact, you may actually get better performance from Classic Mode than booting natively, as the second CPU will handle disk I/O, network I/O, and graphics, letting OS 9 concentrate on other tasks. All in all, Classic Mode is an excellent way to use that old Mac software on Macs with more power than ever booted the Classic Mac OS natively.

Where to Buy OS 9

Speaking of OS 9, a reader question that crops up fairly frequently is where to obtain an OS 9 install CD. They are getting mighty thin on the ground these days. eBay is a possible source, but note well that System software restore CDs that ship with particular Mac models in most cases will not work with machines other than the one they come bundled with.

Several resellers list OS 9 CDs, but often at prices that won’t save you much, if anything, over going the conventional route of paying $129.95 for OS X (through 10.4) plus the $19.95 surcharge for OS 9.2.2. Here are some online sources. Visit the respective Websites and run a search for “OS 9” or “OS 9.1”.

BetaMacs

One outlet that still sells OS 9 CDs is BetaMacs, which offers Apple System 9.0 software for the reasonable price of $19.99, which you can update to any of the later OS 9.x versions using the free updater downloads as described above.

According to BetaMacs, this OS 9 installer Installs a full suite of Apple software, unlike the iMac CD that is often sold on eBay, and works on:

Power Mac 7200-9600 (request OS 9.1 CD)
Power Mac G3
PowerBook G3
iBook G3
iMac G3
Power Mac G4
PowerBook G4

HardCore Mac

HardCore Mac still has a pretty comprehensive selection of OS 9 (and other Mac OS back to System 7.5) CDs (or floppies for older system version), but their prices are very high. A few examples:

Mac OS 9 – $149.99
Mac OS 9.0.4 full installation CD, in sleeve. – $149.99
Mac OS 9.1 Many people think a Mac OS 9.0 installation is needed before Mac OS 9.1 can be installed. This is NOT TRUE. If you need Mac OS 9.0, Mac OS 9.1 will work. – $159.99
Mac OS 9.1 Retail Shrinkwrap packaging – $199.99
Mac OS 9.2.1 CD in sleeve. Full installation. Not an upgrade CD. – $159.99
Mac OS 9.2.2 – $159.99

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Also see , which is updated a few times a year.

Note well that any version of OS 9 – including OS 9.0, 9.0.4, 9.1, 9.2, and 9.2.1 – can be upgraded to the current 9.2.2 using free updaters that can be downloaded from Apple’s software support site (except for the above-mentioned NuBus machines).

PowerPC Macs came to the end with OS 9.2.2, bundled on their Software Restore CDs, although on the later machines not installed by default, and if you choose to install it, it only supports Classic Mode. If you install, it’s a good idea to drag a fresh copy of the OS 9 System Folder to backup media, which will allow you to restore it by simply dragging it back to your hard drive, instead of the tedium of running the software restore CD or DVD.

Helpful Addons

Apple generally provides excellent software, but sometimes a third-party app turns out to be a better solution – especially if you want to use a multi-button mouse.

Clean-Install Assistant makes migrating to another Classic Mac OS machine or a newer version of the Mac OS a lot easier.
MenuChoice provides a better implementation of a hierarchical Apple menu than Apple’s Menu Options.
SmoothType does a better job rendering TrueType and Type 1 fonts than Apple’s own rendering engine – or Adobe Type Manager.
USB Overdrive gives you control over the “extra” buttons on third-party USB mice. You can now download USB Overdrive 1.4 for Mac OS 9 for free. (It used to be $20 shareware.)
BBEdit Lite, a great freeware text editor.

Online Support

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Mac OS 9 – It’s Still Alive!, Facebook
Mac OS 9 group, Google Groups

Links

This document is that latest in a series of Mac OS 9 compatibility, upgrades, and resources guides that Charles W Moore has been updating since May 2003. This has been the most popular topic in the history of the Miscellaneous Ramblings column; earlier versions have been viewed over 170,000 times.

Note: This article has been updated from the 2008 edition. As we publish this article, os9forever.com is offline, so we are unable to verify that links to it still work. Dan Knight, publisher.

* No, it isn’t a typo. Compleat is a legitimate, albeit archaic, alternate spelling for complete. As Kenneth G. Wilson says in The Columbia Guide to Standard American English: “This obsolete spelling of the adjective complete suggests an air of antiquity that seems to please some of those who name things….” We find that fitting for Low End Mac’s Compleat Guides to “obsolete” hardware and software.

Short link: http://goo.gl/epytJJ

searchword: compleatos9

To use a keyboard shortcut, press and hold one or more modifier keys and then press the last key of the shortcut. For example, to use Command-C (copy), press and hold the Command key, then the C key, then release both keys. Mac menus and keyboards often use symbols for certain keys, including modifier keys:

On keyboards made for Windows PCs, use the Alt key instead of Option, and the Windows logo key instead of Command.

Some keys on some Apple keyboards have special symbols and functions, such as for display brightness , keyboard brightness , Mission Control, and more. If these functions aren't available on your keyboard, you might be able to reproduce some of them by creating your own keyboard shortcuts. To use these keys as F1, F2, F3, or other standard function keys, combine them with the Fn key.

Cut, copy, paste, and other common shortcuts

Command-X: Cut the selected item and copy it to the Clipboard.
Command-C: Copy the selected item to the Clipboard. This also works for files in the Finder.
Command-V: Paste the contents of the Clipboard into the current document or app. This also works for files in the Finder.
Command-Z: Undo the previous command. You can then press Shift-Command-Z to Redo, reversing the undo command. In some apps, you can undo and redo multiple commands.
Command-A: Select All items.
Command-F: Find items in a document or open a Find window.
Command-G: Find Again: Find the next occurrence of the item previously found. To find the previous occurrence, press Shift-Command-G.
Command-H: Hide the windows of the front app. To view the front app but hide all other apps, press Option-Command-H.
Command-M: Minimize the front window to the Dock. To minimize all windows of the front app, press Option-Command-M.
Command-O: Open the selected item, or open a dialog to select a file to open.
Command-P: Print the current document.
Command-S: Save the current document.
Command-T: Open a new tab.
Command-W: Close the front window. To close all windows of the app, press Option-Command-W.
Option-Command-Esc: Force quit an app.
Command–Space bar: Show or hide the Spotlight search field. To perform a Spotlight search from a Finder window, press Command–Option–Space bar. (If you use multiple input sources to type in different languages, these shortcuts change input sources instead of showing Spotlight. Learn how to change a conflicting keyboard shortcut.)
Control–Command–Space bar: Show the Character Viewer, from which you can choose emoji and other symbols.
Control-Command-F: Use the app in full screen, if supported by the app.
Space bar: Use Quick Look to preview the selected item.
Command-Tab: Switch to the next most recently used app among your open apps.
Shift-Command-5: In macOS Mojave or later, take a screenshot or make a screen recording. Or use Shift-Command-3 or Shift-Command-4 for screenshots. Learn more about screenshots.
Shift-Command-N: Create a new folder in the Finder.
Command-Comma (,): Open preferences for the front app.

Sleep, log out, and shut down shortcuts

You might need to press and hold some of these shortcuts for slightly longer than other shortcuts. This helps you to avoid using them unintentionally.

Power button: Press to turn on your Mac or wake it from sleep. Press and hold for 1.5 seconds to put your Mac to sleep.* Continue holding to force your Mac to turn off.
Option–Command–Power button* or Option–Command–Media Eject : Put your Mac to sleep.
Control–Shift–Power button* or Control–Shift–Media Eject : Put your displays to sleep.
Control–Power button* or Control–Media Eject : Display a dialog asking whether you want to restart, sleep, or shut down.
Control–Command–Power button:* Force your Mac to restart, without prompting to save any open and unsaved documents.
Control–Command–Media Eject : Quit all apps, then restart your Mac. If any open documents have unsaved changes, you will be asked whether you want to save them.
Control–Option–Command–Power button* or Control–Option–Command–Media Eject : Quit all apps, then shut down your Mac. If any open documents have unsaved changes, you will be asked whether you want to save them.
Control-Command-Q: Immediately lock your screen.
Shift-Command-Q: Log out of your macOS user account. You will be asked to confirm. To log out immediately without confirming, press Option-Shift-Command-Q.

* Does not apply to the Touch ID sensor.

Finder and system shortcuts

Command-D: Duplicate the selected files.
Command-E: Eject the selected disk or volume.
Command-F: Start a Spotlight search in the Finder window.
Command-I: Show the Get Info window for a selected file.
Command-R: (1) When an alias is selected in the Finder: show the original file for the selected alias. (2) In some apps, such as Calendar or Safari, refresh or reload the page. (3) In Software Update preferences, check for software updates again.
Shift-Command-C: Open the Computer window.
Shift-Command-D: Open the desktop folder.
Shift-Command-F: Open the Recents window, showing all of the files you viewed or changed recently.
Shift-Command-G: Open a Go to Folder window.
Shift-Command-H: Open the Home folder of the current macOS user account.
Shift-Command-I: Open iCloud Drive.
Shift-Command-K: Open the Network window.
Option-Command-L: Open the Downloads folder.
Shift-Command-N: Create a new folder.
Shift-Command-O: Open the Documents folder.
Shift-Command-P: Show or hide the Preview pane in Finder windows.
Shift-Command-R: Open the AirDrop window.
Shift-Command-T: Show or hide the tab bar in Finder windows.
Control-Shift-Command-T: Add selected Finder item to the Dock (OS X Mavericks or later)
Shift-Command-U: Open the Utilities folder.
Option-Command-D: Show or hide the Dock.
Control-Command-T: Add the selected item to the sidebar (OS X Mavericks or later).
Option-Command-P: Hide or show the path bar in Finder windows.
Option-Command-S: Hide or show the Sidebar in Finder windows.
Command–Slash (/): Hide or show the status bar in Finder windows.
Command-J: Show View Options.
Command-K: Open the Connect to Server window.
Control-Command-A: Make an alias of the selected item.
Command-N: Open a new Finder window.
Option-Command-N: Create a new Smart Folder.
Command-T: Show or hide the tab bar when a single tab is open in the current Finder window.
Option-Command-T: Show or hide the toolbar when a single tab is open in the current Finder window.
Option-Command-V: Move the files in the Clipboard from their original location to the current location.
Command-Y: Use Quick Look to preview the selected files.
Option-Command-Y: View a Quick Look slideshow of the selected files.
Command-1: View the items in the Finder window as icons.
Command-2: View the items in a Finder window as a list.
Command-3: View the items in a Finder window in columns.
Command-4: View the items in a Finder window in a gallery.
Command–Left Bracket ([): Go to the previous folder.
Command–Right Bracket (]): Go to the next folder.
Command–Up Arrow: Open the folder that contains the current folder.
Command–Control–Up Arrow: Open the folder that contains the current folder in a new window.
Command–Down Arrow: Open the selected item.
Right Arrow: Open the selected folder. This works only when in list view.
Left Arrow: Close the selected folder. This works only when in list view.
Command-Delete: Move the selected item to the Trash.
Shift-Command-Delete: Empty the Trash.
Option-Shift-Command-Delete: Empty the Trash without confirmation dialog.
Command–Brightness Down: Turn video mirroring on or off when your Mac is connected to more than one display.
Option–Brightness Up: Open Displays preferences. This works with either Brightness key.
Control–Brightness Up or Control–Brightness Down: Change the brightness of your external display, if supported by your display.
Option–Shift–Brightness Up or Option–Shift–Brightness Down: Adjust the display brightness in smaller steps. Add the Control key to this shortcut to make the adjustment on your external display, if supported by your display.
Option–Mission Control: Open Mission Control preferences.
Command–Mission Control: Show the desktop.
Control–Down Arrow: Show all windows of the front app.
Option–Volume Up: Open Sound preferences. This works with any of the volume keys.
Option–Shift–Volume Up or Option–Shift–Volume Down: Adjust the sound volume in smaller steps.
Option–Keyboard Brightness Up: Open Keyboard preferences. This works with either Keyboard Brightness key.
Option–Shift–Keyboard Brightness Up or Option–Shift–Keyboard Brightness Down: Adjust the keyboard brightness in smaller steps.
Option key while double-clicking: Open the item in a separate window, then close the original window.
Command key while double-clicking: Open a folder in a separate tab or window.
Command key while dragging to another volume: Move the dragged item to the other volume, instead of copying it.
Option key while dragging: Copy the dragged item. The pointer changes while you drag the item.
Option-Command while dragging: Make an alias of the dragged item. The pointer changes while you drag the item.
Option-click a disclosure triangle: Open all folders within the selected folder. This works only when in list view.
Command-click a window title: See the folders that contain the current folder.
Learn how to use Command or Shift to select multiple items in the Finder.
Click the Go menu in the Finder menu bar to see shortcuts for opening many commonly used folders, such as Applications, Documents, Downloads, Utilities, and iCloud Drive.

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Document shortcuts

The behavior of these shortcuts may vary with the app you're using.

Command-B: Boldface the selected text, or turn boldfacing on or off.
Command-I: Italicize the selected text, or turn italics on or off.
Command-K: Add a web link.
Command-U: Underline the selected text, or turn underlining on or off.
Command-T: Show or hide the Fonts window.
Command-D: Select the Desktop folder from within an Open dialog or Save dialog.
Control-Command-D: Show or hide the definition of the selected word.
Shift-Command-Colon (:): Display the Spelling and Grammar window.
Command-Semicolon (;): Find misspelled words in the document.
Option-Delete: Delete the word to the left of the insertion point.
Control-H: Delete the character to the left of the insertion point. Or use Delete.
Control-D: Delete the character to the right of the insertion point. Or use Fn-Delete.
Fn-Delete: Forward delete on keyboards that don't have a Forward Delete key. Or use Control-D.
Control-K: Delete the text between the insertion point and the end of the line or paragraph.
Fn–Up Arrow: Page Up: Scroll up one page.
Fn–Down Arrow: Page Down: Scroll down one page.
Fn–Left Arrow: Home: Scroll to the beginning of a document.
Fn–Right Arrow: End: Scroll to the end of a document.
Command–Up Arrow: Move the insertion point to the beginning of the document.
Command–Down Arrow: Move the insertion point to the end of the document.
Command–Left Arrow: Move the insertion point to the beginning of the current line.
Command–Right Arrow: Move the insertion point to the end of the current line.
Option–Left Arrow: Move the insertion point to the beginning of the previous word.
Option–Right Arrow: Move the insertion point to the end of the next word.
Shift–Command–Up Arrow: Select the text between the insertion point and the beginning of the document.
Shift–Command–Down Arrow: Select the text between the insertion point and the end of the document.
Shift–Command–Left Arrow: Select the text between the insertion point and the beginning of the current line.
Shift–Command–Right Arrow: Select the text between the insertion point and the end of the current line.
Shift–Up Arrow: Extend text selection to the nearest character at the same horizontal location on the line above.
Shift–Down Arrow: Extend text selection to the nearest character at the same horizontal location on the line below.
Shift–Left Arrow: Extend text selection one character to the left.
Shift–Right Arrow: Extend text selection one character to the right.
Option–Shift–Up Arrow: Extend text selection to the beginning of the current paragraph, then to the beginning of the following paragraph if pressed again.
Option–Shift–Down Arrow: Extend text selection to the end of the current paragraph, then to the end of the following paragraph if pressed again.
Option–Shift–Left Arrow: Extend text selection to the beginning of the current word, then to the beginning of the following word if pressed again.
Option–Shift–Right Arrow: Extend text selection to the end of the current word, then to the end of the following word if pressed again.
Control-A: Move to the beginning of the line or paragraph.
Control-E: Move to the end of a line or paragraph.
Control-F: Move one character forward.
Control-B: Move one character backward.
Control-L: Center the cursor or selection in the visible area.
Control-P: Move up one line.
Control-N: Move down one line.
Control-O: Insert a new line after the insertion point.
Control-T: Swap the character behind the insertion point with the character in front of the insertion point.
Command–Left Curly Bracket ({): Left align.
Command–Right Curly Bracket (}): Right align.
Shift–Command–Vertical bar ( ): Center align.
Option-Command-F: Go to the search field.
Option-Command-T: Show or hide a toolbar in the app.
Option-Command-C: Copy Style: Copy the formatting settings of the selected item to the Clipboard.
Option-Command-V: Paste Style: Apply the copied style to the selected item.
Option-Shift-Command-V: Paste and Match Style: Apply the style of the surrounding content to the item pasted within that content.
Option-Command-I: Show or hide the inspector window.
Shift-Command-P: Page setup: Display a window for selecting document settings.
Shift-Command-S: Display the Save As dialog, or duplicate the current document.
Shift–Command–Minus sign (-): Decrease the size of the selected item.
Shift–Command–Plus sign (+): Increase the size of the selected item. Command–Equal sign (=) performs the same function.
Shift–Command–Question mark (?): Open the Help menu.

Other shortcuts

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For more shortcuts, check the shortcut abbreviations shown in the menus of your apps. Every app can have its own shortcuts, and shortcuts that work in one app might not work in another.

Apple Music shortcuts: Choose Help > Keyboard shortcuts from the menu bar in the Music app.
Other shortcuts: Choose Apple menu > System Preferences, click Keyboard, then click Shortcuts.

Learn more

Create your own shortcuts and resolve conflicts between shortcuts
Change the behavior of the function keys or modifier keys