fxkl4...@protonmail.com wrote: 
> when i type ssh and two tabs i get a list of host
> numeric and names
> where do they come from

Assuming that your shell is bash, it comes from the bash tab
completion function, which has an optional package:

bash-completion/stable,now 1:2.11-6 all 
  programmable completion for the bash shell

and many packages add such completions to that, if available.


Read up on how it works in `man bash` under the title
Programmable Completion.

-dsr-

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