> What's a good method for blocking access to the POSIX shell?
You might try using an ACD like in ALTSEC SH.HPBIN.SYS;NEWACD=(X:MANAGER.SYS).
Depending on your system's use of the Shell (don't forget about command files
or batch jobs that might be using it for "little tricks", sending kill signals
to stop certain server jobs, etc) you might need to grant eXecute access to
more than just manager.sys (which would override the ACD due to SM anyway).
Also keep in mind that an OS update or patch might remove the ACD.
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