Need to create a simple script using MD5, SSH... Post: 302501137

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Top Forums Shell Programming and Scripting Need to create a simple script using MD5, SSH... Post 302501137 by zixzix01 on Wednesday 2nd of March 2011 06:09:41 PM

03-02-2011

Registered User

Thank you very much for your quick reply. This seems to be something I can shoot off of. Thank you for an introduction.

I think though that the script should not really base itself on a "master" server. I want to check all the servers at once, and find out the latest, most important files, whether they are on the main server or not. Do you understand what I mean.

I think I can work off of your example and see if I can work something out. But if you have any other suggestions I would love to hear them!

My boss had his script starting with declaring something and then he used the Vi file with the /pathname/files which differed for that declaration in a string:
Something to the effect of how you proposed:

Code:

for box in node1 node2 node3       # check each remote mirror
    do
        t=$(ssh myusername@$box "md5 /path/to/file/$bname" ) 
        test_hash=$(echo "$t" | awk '{print $4}')
        if [ "$hash"  != "$test_hash ] ;  then         # files are not identical
             scp $fname myusername@$box:/path/to/file/$bname
             ssh /path/to/file/$bname "chmod 775 /path/to/file/$bname"
        fi

I think he declares the "t" beforehand, and then assigns the values from one of the hostname sripts!

Code:

Ask your boss about the chmod statement.  You may not need it.

I don't think I need to change permissions on the files, he didn't use that in his script!

Thank you so much for all your help!
Ivan

P.S. Hey while I have you, how can I read his scripts that he made. They are executable and just say hostname, and host. If I open them with Vi they just read "executable" on the bottom! Weird! I'm trying to understand his approach to scripting, he's amazing!

zixzix01

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LEARN ABOUT LINUX

ssh-copy-id

SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME

       ssh-copy-id - install your public key in a remote machine's authorized_keys

SYNOPSIS

       ssh-copy-id [-i [identity_file]] [user@]machine

DESCRIPTION

       ssh-copy-id  is	a script that uses ssh to log into a remote machine and append the indicated identity file to that machine's ~/.ssh/autho-
       rized_keys file.

       If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in  your
       ssh-agent.  Otherwise, if this:

	     ssh-add -L

       provides any output, it uses that in preference to the identity file.

       If  the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file.  Once it has one or more fin-
       gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory,
       if necessary.)

NOTES

       This program does not modify the permissions of any pre-existing files or directories. Therefore, if the remote sshd has StrictModes set in
       its configuration, then the user's home, ~/.ssh folder, and ~/.ssh/authorized_keys file may need to have group writability  disabled  manu-
       ally, e.g. via

	     chmod go-w ~ ~/.ssh ~/.ssh/authorized_keys

       on the remote machine.

SEE ALSO

       ssh(1), ssh-agent(1), sshd(8)

OpenSSH 							 14 November 1999						    SSH-COPY-ID(1)