Show Commands in Terminal?

Can someone please tell me how to show all available commands?

I just watched a great video on setting up containers in RoS and in Terminal the narrator entered:

container/

and a line of available commands came up. I’d like to see the commands, but it doesn’t happen on my system.

Looks like this:

Untitled.jpg
Thanks!

double tap the TAB key on keyboard, or hit F1 on keyboard

Perfect!

Thank you very much.

Just read what appears written when you open the terminal …
[?] Gives the list of available commands
command [?] Gives help on the command and list of arguments

[Tab] Completes the command/word. If the input is ambiguous,
a second [Tab] gives possible options

/ Move up to base level
.. Move up one level
/command Use command at the base level

I read that prior to posting.

It doesn't work.