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The command-specific information is available today through the COMMAND_INFO view.
IBM is accepting this Idea as a request for a new service that would return parameter information, including the initial defaults for parameters.
Db2 for i development team
IBM Power Systems Development
There is already an SQL service for commands QSYS2.COMMAND_INFO: https://www.ibm.com/docs/en/i/7.5?topic=services-command-info-view
It will return the most of the things you are asking for, but it will not return the commands parameters.
To see if a command have changed defaults, you can use the QSYS2.OBJECT_STATISTICS, however, it will not show which parameter that have been changed from default.
You can use a combination of QSYS2.COMMAND_INFO and QSYS2.OBJECT_STATISTICS to get command info and if the defaults have been changed.
This is an example of listing the commands in QSYS:
select A.*, B.APAR_ID, B.USER_CHANGED from QSYS2.COMMAND_INFO A, lateral (select APAR_ID, USER_CHANGED from table(QSYS2.OBJECT_STATISTICS(COMMAND_LIBRARY, '*CMD', COMMAND_NAME))) B where A.COMMAND_LIBRARY = 'QSYS';