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Security Through Obscurity

Mac OS X Display Access Warnings Message For The Login Window

I know how to display notice of a computer's ownership, to warn against unauthorized access, under Linux gnome desktop. How do I display similar message under Apple Mac OS X to remind authorized users of their consent to monitoring?
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sshpass: Login To SSH Server / Provide SSH Password Using A Shell Script

How do I login over ssh without using password less RSA / DSA public keys? How do I use ssh in a shell script? How do I login non-interactivly performing password authentication with SSH and shell scripts?
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How To Hide BIND DNS Sever Version

Q. How do I hide my dns server version number from command such as:
dig @ns1.example.com -c CH -t txt version.bind

How do I hide version under BIND9 Linux / UNIX systems?
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