How to save ssh-keyscan result with the port to .ssh/known_hosts

Question

Hello developers I am Ravi Singh Chauhan I get error taht says:- NullReferenceException: Object reference not set to an instance of an object Crosshair.OnGUI () (at Assets/Scripts/Combat/Crosshair.cs:22) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)

My Crosshair script is here:- https://i.stack.imgur.com/hD2NE.jpg

Please help me to solve this error

Solution

This is usually not needed since current ssh-keyscan versions will add the port for you. Older versions did not do that. You could post-process the line with sed like this:

ssh-keyscan -p NNN -t rsa GITHOST | sed -E 's/^([^ \[]+) (.*)$/[\1]:NNN \2/'

The output of ssh-keyscan is piped into sed that will use a substitute regexp to transform the output of ssh-keyscan to include the port.

This will result in:

[GITHOST]:NNN ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQCZw....

Update: I refined the regexp above to play nice with ssh-keyscan output in already correct format.

Comments

[Tim S.]

When you say you added it to known_hosts, what exactly did you add? How does the known_hosts file look?

[Jakuje]

what system are you using? Do you have HashKnownHosts=yes? If so, you will need to hash your hosts fin that file using ssh-keygen -H after that.