Question Hi Robert,
If I use ssh (from machine A)to enter other machine,
can the root or system admin(of machine A)use ssh sniffer to
see anything I did via this ssh session?
Answer Hi ground,
If the system administrator rolled a custom ssh binary that you use, it is possible that that custom binary could be both a keystroke logger and a working ssh client.
Although, if you're on a trusted server, ie you trust the system administrator and the IT team, this is likely not the case. But, the above is possible.