SSH config file - Run command before connection

Question

i cannot run a command before connect with ssh to remote server using ~/.ssh/config file.

I have tried with options "ProxyCommand" and "LocalCommand" but it doesn't work.

ProxyCommand: seems it run the command, but after that doesn't ask me the password of ssh connection
LocalCommand: run the command only if the connection successful

Theorectically it could be done with ProxyCommand and passing a scriptname that contains what you want to be executed, but you need to ensure that the script ends with setting up a connection to the remote host, fulfilling the "proxy" part. E.g. /usr/bin/nc %h %p — wurtel, Jan 4, 2019 at 12:34
@JeffSchaller Thanks for your answare. Yes, before i was using aliases, but config file of ssh is more portable and smart than aliases. — Killouis, Jan 4, 2019 at 15:01
@wurtel Thanks for your answare. Can i put my command and on success execute "nc" without log? E.g. /bin/echo hello > /tmp/test && /usr/bin/nc %h %p > /dev/null 2>&1 — Killouis, Jan 4, 2019 at 15:04

Silas S. Brown · Accepted Answer · 2020-08-25 21:11:35Z

1

See these answers: https://unix.stackexchange.com/a/44343 (using ProxyCommand) and https://askubuntu.com/a/1268036 (using Match host ... exec)

answered Aug 25, 2020 at 21:11

Silas S. Brown

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I solved with the Match host! Thank you @silas-s-brown :)
– Killouis
Dec 26, 2020 at 18:19

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