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Full Discussion: Expect in Bash - and then compare md5sum
Top Forums UNIX for Beginners Questions & Answers Expect in Bash - and then compare md5sum Post 302977886 by bakunin on Friday 22nd of July 2016 06:09:19 PM
Old 07-22-2016
Don Cragun is right, rsync would be the solution of first choice.

But still, if this is ruled out somehow for some reason we have yet to find out:

Quote:
Originally Posted by xgringo
I don't need to check connectivity but if config files are the same in certain directories.
If you do not need to check for connectivity then all the better. But in your threads title and the first post you mentioned you have to use "expect" and this can conceivably only be to transmit passwords. If you can guarantee somehow your ssh-keys can always be readily exchanged (though i'd still check that before i'd base my procedures on that) you can simply use ssh to remote-execute any command(s) you want and that would probably be a cleaner solution than using expect to initiate a pseudo-interactive ssh-session.

If you need to remotely execute arbitrary commands then you might want to do it this way (sketch):

Code:
while read HOST USER ; do
     if ! ssh -nqo 'BatchMode=yes' "$USER"@"$HOST" some_command
          echo "Error: some_command returned $?"
     fi
done <<_EOF_
host1 user1
host2 user2
....
_EOF_

Again, I'd check if indeed the keys are exchanged by including the function i showed you and call it somewhere inside the loop as part of my errror checking, but that is up to you. You should be able to build your custom routine around the shown mechanism pretty easily.

I hope this helps.

bakunin
 

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LEARN ABOUT FREEBSD

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_ed25519_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.

     /etc/ssh/ssh_host_dsa_key-cert.pub
     /etc/ssh/ssh_host_ecdsa_key-cert.pub
     /etc/ssh/ssh_host_ed25519_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
								 December 7, 2013							       BSD
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