Unfortunately the ENVI LiDAR user interface is not supported on Linux. We have a list of supported features by platform at
http://www.harrisgeospati...FeatureSupport.html. However, the ENVI LiDAR API is supported on Linux, so you could write an IDL script to process point clouds. A good place to start is the ENVI::OpenPointCloud method. See
http://www.harrisgeospati..._openpointcloud.html for an example.