The /Applications/VisualDiffer.app/Contents/Resources folder contains the executable file
visdiff that integrates with VisualDiffer.app
You can launch
visdiff to visually show files or folders comparison using the following syntax
visdiff <left file or folder> <right file or folder>
Wait for document close
If you need to wait the user closes the diff document window (not necessary to quit application) associated to visdiff command you can pass the switch
Creating a symbolic link
VisualDiffer.app doesn’t install the terminal application but manually it is possible to create the link to the shell command.
It requires root access, from a terminal prompt type the command shown below
Note: VisualDiffer can’t install command line tool from its User Interface to comply with Apple’s submission guidelines
OSX sandbox, temporary files and annoying file open panel prompts
VisualDiffer was sandboxed starting from version 1.4.2 and many users found using it very annoying because any comparison prompts to pick folders/files.
This problem was fixed on version 1.4.3 introducing the so called “Trusted Paths”, please refer to Trusted Paths for further details