A podcast about all things Macintosh. For Mac geeks, by Mac geeks. Episode 040. How to hack your dock to operate in single-application mode. Plus, some additional commands and modifier keys you can use with OS X’s Dock.

Command to enable single app mode using the Terminal:
1) Type defaults write com.apple.dock single-app -bool true
2) Press Enter
3) Type killall Dock
4) Press Enter

Command to disable single app mode using the Terminal:
1) Type defaults write com.apple.dock single-app -bool false
2) Press Enter
3) Type killall Dock
4) Press Enter.

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Links
Mac OS X: Additional features of the Dock
Secrets