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I also used the AS/400 / System i / IBM i, back when it was called the System/38.

The feature I most miss is command prompting. Type a command name, press F4, and fill in the blanks for the parameters. If a parameter takes enumerated values, type in a question mark (?) and get a list of the allowed values.

That was great for productivity.

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Is this like PowerShell's `Show-Command` and the earlier Macintosh Programmer's Workbench Commando?

Yes, same basic concept. Display a fill-in form to guide the user in filling out the command parameters. The main difference is that the OS/400 display a text mode form (5250 block mode terminal form), whereas PowerShell Show-Command and MPW Commando are both GUI tools.

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