Explanation
Log on to JD Edwards EnterpriseOne with <user>, <pwd>, <environment>, and <role>.
Load the spec image stub from <stub file>.
Generate the spec image with the image type <image type>.
The spec image is written to the <output file> (or System.out if /OutputFile not present).
Error messages are written to the <error file> (or System.err if /ErrorFile not present).