I found this on the net which has a full list of all the CAT commands.
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I have heard that some of the commands can eventually wear out the memory position and brick the radio so I¡¯d be careful of what commands you use. I do not have any personal experience of using it myself, however, I believe that was the reason that some functions were removed from HRD. I would suggest more research into it before using those commands. The 857 manual does not list a command for the AGC, nor do the 817 or 897 manuals.