defaults write com.apple.screencapture type [string]

Title		Placeholder
Bundle ID/Path		Display Bundle
Key		Display Group
Default value		Options	kCFPreferencesCurrentHost kCFPreferencesAnyUser Keypath
Datatype	Boolean Boolean (Negate) Integer Float String Bundle Identifier Font Name File Path Rect Array Array (Add) Array (Multi Add) Dictionary Dictionary (Add) Date Color URL	Units	Widget Popup
Description	Note: After you've changed this value once, a reboot is required after every subsequent change.	Flags	Verified Hide from UI Dangerous For Debug Broken Has Application UI
Values (as plist)	JPEG = jpg; PDF = pdf; PNG = png; TIFF = tif;	OS Version	to
		App Version	to
Notes	If you don't want to reboot, you can kill SystemUIServer instead
This change will affect all users.

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