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I'm trying to connect to machine one with ssh and then connect to another machine two with ssh. But get this error:
ssh [email protected] 'ssh [email protected]' stdin: is not a tty 
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When you run ssh without a command just to login, a pseudo tty is automatically allocated. But if you specify a command to execute on the ssh command line, by default, ssh does not allocate a pseudo tty. You need to force it to allocate one if you want to run commands such as top or screen.
/dev/tty is the controlling terminal for the current process. STDIN is the current input. If you redirect, e.g., perl script.pl <myfile.txt.
When logging into a shell, the remote host assumes that the connection is done by a human user. Therefore, it is reasonable to expect that they have control over the standard in on the client. That is to say, the user is giving input on a terminal through the keyboard. If the remote host detects that the user is not human (because the input is not a terminal - tty, but another process), it may warn the user about this unexpected condition.
A demonstration of the discussed misbehavior and how to avoid it (man ssh and look for -t for a more thorough explanation).
$ ssh -t genja.org 'ssh raptor.lan hostname\; uptime' host: genja.lan raptor 21:17:27 up 3 days, 15 min, 1 user, load average: 0.00, 0.00, 0.00 Connection to genja.org closed. $ ssh genja.org uptime host: genja.lan 21:17:43 up 12 days, 17:40, 1 user, load average: 0.30, 0.08, 0.02 ...and the error:
$ ssh genja.org 'ssh raptor.lan hostname\; uptime' host: genja.lan Permission denied (publickey,keyboard-interactive). You may want to make a tunnel instead:
ssh -L 4444:raptor.lan:22 genja.org Then, on a different terminal:
ssh -p 4444 localhost will give you a conenction straight to "raptor.lan" Use IP addresses such as 192.168.0.11 if DNS aliases are not configured on the remote end.
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