Since the CLI module is in an extension you need to use a command like this:
~/Downloads/Slicer-5.2.2-linux-amd64/Slicer --launch bash -c UKFTractography
Since the CLI module is in an extension you need to use a command like this:
~/Downloads/Slicer-5.2.2-linux-amd64/Slicer --launch bash -c UKFTractography