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Full Discussion: connect to multiple servers using SSH and execute commands
Top Forums Shell Programming and Scripting connect to multiple servers using SSH and execute commands Post 302553389 by Corona688 on Wednesday 7th of September 2011 11:49:15 AM
Old 09-07-2011
UNIX tools are so flexible that hunting for a way to login and do checksums is like hunting for a programming language designed to print the letter 'A'. Not likely someone's going to have had the exact same problem as you, but you can use things you know and put them together... like ssh, and loops:

Code:
#!/bin/sh

while read SERVER
do
        # Using "/bin/sh -s" lets us carefully control what inputs we give the remote program.
        # Arguments after the -s will show up as $1, $2, $3...  The program itself is read
        # from standard input.  We pipe it in with a here-document.
        ssh username@"$SERVER" /bin/sh -s "filename" "checksum" "path" <<"EOF"
                echo "Filename is $1"
                echo "Checksum is $2"
                echo "Path is $3"
# This EOF ought to be at the beginning of the line and NOT indented.
EOF
done < serverlist

If you know how to verify the checksum on a local server, you know how to do so on a remote server: Just write the code between the <<"EOF" and EOF. No local variables will make it in except ones you put on the commandline, like where "filename" "checksum" "path" is.

If you don't, I'll need more information on what exactly you're trying to do -- what form of checksum for example.
 

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LEARN ABOUT SUSE

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_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.

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
								   May 31, 2007 							       BSD
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