Mute Startup Sound:

sudo nvram StartupMute=%01

Erase Hard Disk:

diskutil eraseDisk JHFS+ empty /dev/disk1

Force rebuild of Finder Prefs:

mv ~/Library/Preferences/com.apple.finder.plist ~/Desktop/

Make Library Folder visible:

chflags nohidden ~/Library/

Cleanup Finder database:

/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -domain local -domain system -domain user

Backup iPad on external disk (named “disk2s2”):

ln -s /Volumes/disk2s2/Documents/MobileSync/Backup ~/Library/Application\ Support/MobileSync/

Booting in verbose mode:

sudo nvram boot-args=”-v”

Show full path names in all Finder windows:

defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES

Always use expanded save dialog:

defaults write -g NSNavPanelExpandedStateForSaveMode -bool TRUE

Change date to March 18th 2013 12:50 for fooling older MacOS X Installers:

date 0318125013

Purge cached user preferences:

killall -u $USER cfprefsd

Unlock folder and all files therein:

chflags -R nouchg /PATH/TO/DIRECTORY/WITH/LOCKED/FILES/

Enable Screen Sharing

sudo defaults write /var/db/launchd.db/com.apple.launchd/overrides.plist com.apple.screensharing -dict Disabled -bool false
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.screensharing.plist

Remove all files from git cache

git rm -r --cached .
git add .
git commit -m ".gitignore is now working"