plist-buddy

Remote monad wrapper around the plistbuddy shell command for editing plists.

From the manual: The following commands are used to manipulate plist data:

Help -- Prints this information.
Exit -- Exits the program. Changes are not saved to the file.
Save -- Saves the current changes to the file.
Revert -- Reloads the last saved version of the file.
Clear type -- Clears out all existing entries, and creates root of type type. See below for a list of types.
Print [entry] -- Prints value of entry. If an entry is not specified, prints entire file.
Set entry value -- Sets the value at entry to value.
Add entry type [value] -- Adds entry with type type and optional value value. See below for a list of types.
Delete entry -- Deletes entry from the plist.