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:
Dec 02, 2015 As of OS X 10.8 Mountain Lion, Apple dropped 'Mac OS X' and started marketing its operating systems as OS X. It was released in July 25 2012 and introduced new features which are present in the iOS 5, including the Game Center, iMessage support, Reminders as a separate app from iCal, which in turn was renamed to Calendar. Operating Systems Mac OS X 10.4 PPC, Mac OS X 10.5 PPC, Macintosh, Mac OS X 10.6, Mac OS X 10.4 Intel, Mac OS X 10.7, Mac OS X 10.5 Intel. Can you install Mac OS X on an Apple TV (first-gen)? Mac OS X runs on Intel, and the Apple TV uses an Intel Pentium M, so it's gotta be possible, right?
On keyboards made for Windows PCs, use the Alt key instead of Option, and the Windows logo key instead of Command.
The history of macOS, Apple's current Mac operating system originally named Mac OS X until 2012 and then OS X until 2016, began with the company's project to replace its 'classic' Mac OS.That system, up to and including its final release Mac OS 9, was a direct descendant of the operating system Apple had used in its Macintosh computers since their introduction in 1984. Naruto Shippuden: Ultimate Ninja Storm series will offer players a new experience in the deep & rich NARUTO environment. Loophole (pixelmoose studio) mac os. Tons of new techniques, enhanced mechanics, over 100 playable characters & Support Ninjas, and a brand new exclusive character (Mecha-Naruto) designed by Masashi Kishimoto.
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
Ninja Evolution Mac Os X
- 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.
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
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
Ninja is yet another build system. It takes as input theinterdependencies of files (typically source code and outputexecutables) and orchestrates building them, quickly.
The cabinets of doctor arcana mac os. Ninja joins a sea of other build systems. Its distinguishing goal isto be fast. It is born frommywork on the Chromium browser project, which has over 30,000 sourcefiles and whose other build systems (including one built from customnon-recursive Makefiles) would take ten seconds to start buildingafter changing one file. Ninja is under a second.
Where other build systems are high-level languages, Ninja aims to bean assembler.
Build systems get slow when they need to make decisions. When you arein a edit-compile cycle you want it to be as fast as possible — youwant the build system to do the minimum work necessary to figure outwhat needs to be built immediately.
Ninja Evolution Mac Os X
- 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.
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
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
Ninja is yet another build system. It takes as input theinterdependencies of files (typically source code and outputexecutables) and orchestrates building them, quickly.
The cabinets of doctor arcana mac os. Ninja joins a sea of other build systems. Its distinguishing goal isto be fast. It is born frommywork on the Chromium browser project, which has over 30,000 sourcefiles and whose other build systems (including one built from customnon-recursive Makefiles) would take ten seconds to start buildingafter changing one file. Ninja is under a second.
Where other build systems are high-level languages, Ninja aims to bean assembler.
Build systems get slow when they need to make decisions. When you arein a edit-compile cycle you want it to be as fast as possible — youwant the build system to do the minimum work necessary to figure outwhat needs to be built immediately.
Ninja contains the barest functionality necessary to describearbitrary dependency graphs. Its lack of syntax makes it impossibleto express complex decisions.
Instead, Ninja is intended to be used with a separate programgenerating its input files. The generator program (like the./configure
found in autotools projects) can analyze systemdependencies and make as many decisions as possible up front so thatincremental builds stay fast. Going beyond autotools, even build-timedecisions like 'which compiler flags should I use?' or 'should Ibuild a debug or release-mode binary?' belong in the .ninja
filegenerator.
Here are the design goals of Ninja:
- very fast (i.e., instant) incremental builds, even for very large projects.
- very little policy about how code is built. Different projects and higher-level build systems have different opinions about how code should be built; for example, should built objects live alongside the sources or should all build output go into a separate directory? Is there a 'package' rule that builds a distributable package of the project? Sidestep these decisions by trying to allow either to be implemented, rather than choosing, even if that results in more verbosity.
- get dependencies correct, and in particular situations that are difficult to get right with Makefiles (e.g. outputs need an implicit dependency on the command line used to generate them; to build C source code you need to use gcc's
-M
flags for header dependencies). - when convenience and speed are in conflict, prefer speed.
Some explicit non-goals:
- convenient syntax for writing build files by hand. You should generate your ninja files using another program. This is how we can sidestep many policy decisions.
- built-in rules. Out of the box, Ninja has no rules for e.g. compiling C code.
- build-time customization of the build. Options belong in the program that generates the ninja files.
- build-time decision-making ability such as conditionals or search paths. Making decisions is slow.
To restate, Ninja is faster than other build systems because it ispainfully simple. You must tell Ninja exactly what to do when youcreate your project's .ninja
files.
Dungeonscape mac os. Ninja is closest in spirit and functionality to Make, relying onsimple dependencies between file timestamps.
But fundamentally, make has a lot of features: suffix rules,functions, built-in rules that e.g. search for RCS files when buildingsource. Make's language was designed to be written by humans. Manyprojects find make alone adequate for their build problems.
Mac Os Catalina
In contrast, Ninja has almost no features; just those necessary to getbuilds correct while punting most complexity to generation of theninja input files. Ninja by itself is unlikely to be useful for mostprojects.
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Here are some of the features Ninja adds to Make. (These sorts offeatures can often be implemented using more complicated Makefiles,but they are not part of make itself.)
- Ninja has special support for discovering extra dependencies at build time, making it easy to get header dependencies correct for C/C++ code.
- A build edge may have multiple outputs.
- Outputs implicitly depend on the command line that was used to generate them, which means that changing e.g. compilation flags will cause the outputs to rebuild.
- Output directories are always implicitly created before running the command that relies on them.
- Rules can provide shorter descriptions of the command being run, so you can print e.g.
CC foo.o
instead of a long command line while building. - Builds are always run in parallel, based by default on the number of CPUs your system has. Underspecified build dependencies will result in incorrect builds.
- Command output is always buffered. This means commands running in parallel don't interleave their output, and when a command fails we can print its failure output next to the full command line that produced the failure.