On Mon, 30 Jun 2025 at 21:46, Darren Tucker <dtucker@xxxxxxxxxxx> wrote:
> On Mon, 30 Jun 2025 at 20:47, Jochen Bern <Jochen.Bern@xxxxxxxxx> wrote:
>
>> [...] I'd like to change .ssh/config so that when muscle memory does a
>> "ssh too-old-host" again, I get output to the effect of "use the 'foo
>> bar baz' command instead" (and ideally, OpenSSH itself does not even
>> *attempt* to connect).
>> [...]
>> ProxyCommand seems to be unable, too (because its output apparently gets
>> swallowed *entirely* by ssh).
>>
>
> Its stdout does (since that's its purpose), but its stderr doesn't:
>
> $ cat config
> ProxyCommand sh -c "echo use foo instead >&2"
> $ ssh -F ./config foo bar
> use foo instead
> Connection closed by UNKNOWN port 65535
>
You could also set LogLevel quiet to suppress the "connection closed":
$ cat config
Host bar
ProxyCommand sh -c "echo use foo instead >&2"
LogLevel quiet
$ ssh -F ./config bar
use foo instead
--
Darren Tucker (dtucker at dtucker.net)
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860 37F4 9357 ECEF 11EA A6FA
Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
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