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HowTo: Nginx Block User Agent

How do I block a http user agent or a software agent using Nginx web server under Linux or Unix like operating systems?
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Linux Download Password Protected Large ISO Images [ Authentication Credentials ]

I'm trying to download an ISO image for Enterprise Linux from RHN or Novell Suse. Both providers have placed ISO images behind paywall. I need to provide authentication credentials before downloading all files. How do I download ISO files using the wget command with user name and password?
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CentOS / Redhat Linux: Install OpenNTPD To Synchronize The Local Clock

OpenNTPD is a Unix system daemon implementing the Network Time Protocol to synchronize the local clock of a computer system with remote NTP servers. How do I install OpenNTPD under CentOS / RHEL / Fedora Linux instead of default NTPD client / server?
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PHP Add Captcha Protection To Web Forms

I own a small business website. However, bots started to abusing my forms such as contact.php. How do I stop bad bots from abusing my site? How do I tell if PHP form is submitted by a person or a script?
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OpenBSD Install Ports Tree Collection

I have installed OpenBSD operating system but ports collection is missing at /usr/ports directory. How do I install ports from ftp / http site under OpenBSD?
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