If you are trying to read a KJB file from a Zip export but are getting errors, you may have a syntax error in your Kitchen command. Zip files must be prefaced by a ! (exclamation mark) character. On Linux and other Unix-like operating systems, you must escape the exclamation mark with a backslash: \!
Kitchen.bat /file:"zip:file:///C:/Pentaho/PDI Examples/Sandbox/linked_executable_job_and_transform.zip!Hourly_Stats_Job_Unix.kjb"