On 7/31/21, Michael Siegel <msi(a)malbolge.net>
The TOPS-20 COMND JSYS implemented both of these
features, and I
think that command
completion was eventually added to the VMS command
FYI, There is also a unix version of the COMND JSYS capability. It was
developed at Columbia University as part of their "mm" mail manager. It
is located in to the ccmd subdirectory in the mm.tar.gz file.