Does tee command append or overwrite?
By default, the tee command will overwrite the file with the output of the initial command. Which can be overridden by using an append option using -a switch. Like with standard commands appending with >, the errors and stdout are handled differently in tee as well.
What is Sudo tee command?
tee command reads the standard input and writes it to both the standard output and one or more files. The command is named after the T-splitter used in plumbing. It basically breaks the output of a program so that it can be both displayed and saved in a file.
How to run the ssh command until succeeded?
The default is 1 but you can change it in ssh_config or on the command-line: ssh -o ‘ConnectionAttempts 10’ Unfortunately you can’t adjust the attempt interval which is fixed at 1 second, but you can adjust the connection attempt time-out ConnectTimeout (in seconds) in the same fashion.
How can I force SSH to accept a new host?
You should never turn off StrictHostKeyChecking in any real-world system (e.g. it’s probably okay if you’re just playing on your own local home network – but for anything else don’t do it). That will force the known_hosts file to be updated to remove the old key for just the one server that has updated its key.
What happens if I accept a new SSH key?
When you do not check the host key you might land with an SSH session on a different computer (yes, this is possible with IP Hijacking ). A hostile server, which you don’t own can be then used to steal a password and all sort of data. Accepting a new unknown key is also pretty dangerous.
How can I force SSH to accept new host fingerprint from the command line?
The default is ask. To set it system wide, edit /etc/ssh/ssh_config; to set it just for you, edit ~/.ssh/config; and to set it for a single command, give the option on the command line, e.g.