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1. 10.7 - Disable accentuated characters on press

   $ defaults write -g ApplePressAndHoldEnabled -bool false
   

2. 10.7 - Disable Mail animations

   $ defaults write com.apple.Mail DisableSendAnimations -bool YES
   $ defaults write com.apple.Mail DisableReplyAnimations -bool YES
   

3. 10.7 - Prevent an application from reopening windows at launch

   ie disable Resume per application:

   $ defaults write com.apple.Preview NSQuitAlwaysKeepsWindows -int NO
   

4. 10.7 - Turn off window opening animation in Lion

   $ defaults write NSGlobalDomain NSAutomaticWindowAnimationsEnabled -bool NO
   

5. Adjust columns length

   In column mode, double-clic on the ||.

6. Always show expanded save dialogs

   $ defaults write -g NSNavPanelExpandedStateForSaveMode -bool YES
   

7. atos - adresses to symbols

   $ atos -o MyiPhoneBinary -arch armv7 0x00009f16
   -[AppDelegate application:didFinishLaunchingWithOptions:] (in MyiPhoneBinary) (AppDelegate.m:253)
   

8. Boot in verbose mode

   enable:

   $ sudo nvram boot-args="-v"
   

   disable:

   $ sudo nvram boot-args=
   

9. Change login background image

   $ defaults write /Library/Preferences/com.apple.loginwindow DesktopPicture /picture.jpg
   

10. Change screenshot save location

    $ defaults write com.apple.screencapture location ~/Pictures
    $ killall SystemUIServer
    

11. Change screenshots file format

    $ defaults write com.apple.screencapture type jpg
    $ killall SystemUIServer
    

    type may be jpg, pdf, tif or png

12. Disable checksums when mounting disk images

    $ defaults write com.apple.frameworks.diskimages skip-verify -bool true
    $ defaults write com.apple.frameworks.diskimages skip-verify-locked -bool true
    $ defaults write com.apple.frameworks.diskimages skip-verify-remote -bool true
    

13. Disable Dashboard

    $ defaults write com.apple.dashboard mcx-disabled -boolean YES
    $ killall Dock    
    

14. Disable data detectors

    $ defaults write com.apple.mail DisableDataDetectors YES
    

15. Disable iTunes Genius sidebar

    $ defaults write com.apple.iTunes disableGeniusSidebar YES
    

16. Disable menu bar transparency

    $ defaults write NSGlobalDomain AppleEnableMenuBarTransparency -bool false
    

17. Disable Notification Center

    $ launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
    
    $ killall NotificationCenter
    

18. Disable scrollbars animations

    $ defaults write -g NSScrollAnimationEnabled -bool false
    

19. Disable Spaces Animation

    $ defaults write com.apple.dock workspaces-swoosh-animation-off -bool YES
    $ killall Dock
    

20. Disable window shadow on screenshots

    $ defaults write com.apple.screencapture disable-shadow -bool true
    $ killall SystemUIServer
    

21. Display all emails as plain text

    $ defaults write com.apple.mail PreferPlainText -bool YES
    

22. Display various info in the login window

    $ defaults write /Library/Preferences/com.apple.loginwindow AdminHostInfo SystemVersion 
    

    SystemVersion can be replaced by:

    SystemBuild
    SerialNumber 
    IPAddress 
    DSStatus 
    Time
    HostName
    

23. Display wireless networks

    $ /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport -S
    

    See the help page:

    $ airport --help
    

24. Dock - remove the glass look

    $ defaults write com.apple.dock no-glass -boolean YES
    

25. Enable Disk Utility debug menu

    $ defaults write com.apple.DiskUtility DUDebugMenuEnabled -bool true
    

26. Enable Mac App Store debug menu

    $ defaults write com.apple.appstore ShowDebugMenu -bool true
    

    Source: http://www.red-sweater.com/blog/1586/the-mac-app-store-debug-menu

27. Enable screen mirroring

    cmd + F1

28. Enable text selection in Quick Look previews

    $ defaults write com.apple.finder QLEnableTextSelection -bool TRUE; killall Finder
    

29. Finder QuickLook plugin for .text clipping files

    http://hetima.com/soft/clippingql-e.html

30. Gain root access with physical access

    The simplest way:

    Start with cmd-S, then

    # mount /
    # rm /var/db/.AppleSetupDone
    # reboot
    

    and create a new admin account through the assistant.

31. Gradient behind stack icons

    $ defaults write com.apple.dock mouse-over-hilte-stack -boolean YES
    

32. iCloud photo stream

    ~/Library/Application Support/iLifeAssetManagement/assets/sub/
    

33. Increase Dock icon magnification

    $ defaults write com.apple.dock largesize -float 200
    $ killall Dock
    

    128 is the default

34. Install a package in a disk image from command-line

    $ hdiutil attach disk_image.dmg
    $ cd /Volumes/volume_name/
    $ sudo installer -pkg package_name.pkg -target "/"
    $ hditutil detach /Volumes/volume_name/
    

35. LaunchServices and lsregister

    LaunchServices holds the mapping between applications and documents.

    $ /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister
    

    explicitely register an application

    $ lsregister -f MyApp.app
    

    dump the database

    $ lsregister -dump
    

    rebuild the database

    $ lsregister -kill -r -domain local -domain system -domain user
    

36. Mac OS X Version

    $ sw_vers -productVersion
    

37. Mail - Don't include name when copying an email address

    $ defaults write com.apple.mail AddressesIncludeNameOnPasteboard -bool NO
    

38. Make a file invisible

    $ /Developer/Tools/SetFile -a V my_file.txt
    

39. Make Dock hidden icons transparent

    $ defaults write com.apple.Dock showhidden -bool YES
    

40. Open a new Terminal window in the current directory

    $ open -a Terminal `pwd`
    

    great with an alias in your ~/.profile

    alias new="open -a Terminal `pwd`"
    

41. Prevent launching applications from bouncing in the Dock

    $ defaults write com.apple.dock launchanim -bool false
    

42. Prevent PowerBook from waking-up at opening

    $ sudo pmset lidwake 0
    

43. Put a Dashboard widget on the desktop

    $ defaults write com.apple.dashboard devmode YES
    $ killall Dock
    

    Press F12, start moving the widget and hit F12 again. Put the widget on the Desktop.

44. Reload a Dashboard widget

    cmd-R

45. Remove accounts from the login window

    remove accounts:

    $ sudo defaults write /Library/Preferences/com.apple.loginwindow HiddenUsersList -array-add user1 user2 user3
    

    reset:

    $ sudo defaults write /Library/Preferences/com.apple.loginwindow HiddenUsersList -array-add
    

46. Remove Obsolete iOS Device Support and Documentation

    Check the following directories:

    "~/Library/Developer/Xcode/iOS DeviceSupport/"
    "~/Library/Developer/Shared/Documentation/DocSets/"
    

47. Restore "Don’t Save" shortcut

    $ defaults write NSGlobalDomain NSSavePanelStandardDesktopShortcutOnly -bool YES
    

48. Save to disk (not to iCloud) by default

    $ defaults write NSGlobalDomain NSDocumentSaveNewDocumentsToCloud -bool false
    

49. Set title of Finder windows to full path

    $ defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES
    

50. Show AddressBook debug menu

    $ defaults write com.apple.addressbook ABShowDebugMenu -bool YES
    

51. Show build number on Xcode icon

    (and probably other fancy behaviors)

    # mkdir /AppleInternal
    

52. Show only currently active applications in Dock

    $ defaults write com.apple.dock static-only -bool TRUE
    $ killall Dock
    

53. Show startup logs

    # dmesg
    

54. Stop writing .DS_Store files on network volumes

    $ defaults write com.apple.desktopservices DSDontWriteNetworkStores true
    

    see http://support.apple.com/kb/HT1629

55. Use a screensaver as desktop background

    $ /System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine -background
    

56. Verify applications signature

    $ codesign -dvvv TwitHunter.app
    

    result

    Executable=/Users/nst/TwitHunter.app/Contents/MacOS/TwitHunter
    Identifier=ch.seriot.TwitHunter
    Format=bundle with Mach-O thin (x86_64)
    CodeDirectory v=20100 size=589 flags=0x0(none) hashes=21+5 location=embedded
    Hash type=sha1 size=20
    CDHash=d92cea80efead38315b778b0a320db6fceb666fe
    Signature size=8514
    Authority=Developer ID Application: Nicolas Seriot
    Authority=Developer ID Certification Authority
    Authority=Apple Root CA
    Timestamp=Aug 24, 2012 8:07:40 AM
    Info.plist entries=19
    Sealed Resources rules=4 files=6
    Internal requirements count=2 size=292
    

    See also "Mac OS X Code Signing In Depth" http://developer.apple.com/library/mac/#technotes/tn2206/_index.html

57. Where to put Spotlight cache files

    ~/Library/Caches/Metadata/app.bundle.identifier