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Full Discussion: Error Executing a script(SSH problem)
Top Forums UNIX for Dummies Questions & Answers Error Executing a script(SSH problem) Post 302437133 by royalibrahim on Wednesday 14th of July 2010 05:35:02 AM
Old 07-14-2010
The problem is that the loop and ssh (by default) read from the same stdin, and ssh "consumes" (eats) the input to feed it to the remote command, that would otherwise have been read by the loop. Otherwise, you wouldn't be able to run a shell on the remote system. Even when running a specific command, that command might still read from stdin, and since ssh reads from stdin you can supply data to it using the local stdin. Use ssh -n option to redirect stdin from /dev/null (prevents reading from stdin) and use ssh -T that runs the command without attempting to allocate a tty. ssh waits until all connections to stdin (from the ssh perspective) are closed. With an interactive shell the stdout of all child processes is connected to the shell, which maintains a single connection to the terminal. So when the shell terminates that means all connections to the stdin of the ssh session are closed. Without a shell all children are directly connected so the ssh session is forced to stay around.
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LEARN ABOUT OSX

ssh-keysign

SSH-KEYSIGN(8)						    BSD System Manager's Manual 					    SSH-KEYSIGN(8)

NAME

     ssh-keysign -- ssh helper program for host-based authentication

SYNOPSIS

     ssh-keysign

DESCRIPTION

     ssh-keysign is used by ssh(1) to access the local host keys and generate the digital signature required during host-based authentication with
     SSH protocol version 2.

     ssh-keysign is disabled by default and can only be enabled in the global client configuration file /etc/ssh/ssh_config by setting
     EnableSSHKeysign to ``yes''.

     ssh-keysign is not intended to be invoked by the user, but from ssh(1).  See ssh(1) and sshd(8) for more information about host-based authen-
     tication.

FILES

     /etc/ssh/ssh_config
	     Controls whether ssh-keysign is enabled.

     /etc/ssh/ssh_host_dsa_key
     /etc/ssh/ssh_host_ecdsa_key
     /etc/ssh/ssh_host_rsa_key
	     These files contain the private parts of the host keys used to generate the digital signature.  They should be owned by root, read-
	     able only by root, and not accessible to others.  Since they are readable only by root, ssh-keysign must be set-uid root if host-
	     based authentication is used.  Note that ssh-keysign is not set-uid by default on Mac OS X.

     /etc/ssh/ssh_host_dsa_key-cert.pub
     /etc/ssh/ssh_host_ecdsa_key-cert.pub
     /etc/ssh/ssh_host_rsa_key-cert.pub
	     If these files exist they are assumed to contain public certificate information corresponding with the private keys above.

SEE ALSO

     ssh(1), ssh-keygen(1), ssh_config(5), sshd(8)

HISTORY

     ssh-keysign first appeared in OpenBSD 3.2.

AUTHORS

     Markus Friedl <markus@openbsd.org>

BSD
								  August 31, 2010							       BSD
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