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Thank you for the reply.

I think the fingerprint is also the public key of the remote server. It is saved under /etc/ssh/ssh_host_rsa_key.pub on remote server.

I have a query on ssh.

[Local_host] /home/user1/ # ssh remote_host

When the fingerprint created and saved in /home/user1/.ssh/known_hosts file, is the fingerprint the public key of remote_host?

Thank you for the reply.

I have a question here on /etc/passwd file.

There is a user called user_a, when it is defined in /etc/passwd as below
+user_a:x:::::/bin/ksh
after user_a login, the system could not recognize...

I have a silly question here.

Under the shell prompt, when I launch a command (if the command is not part of shell, like 'awk') , how does the shell work?

I don't understand that if the...