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How to apply patches on OpenBSD system/kernel and packages easily

I am a regular Linux system user. In Linux (especially CentOS), I am used to applying updates a few times a week using yum command, but how do I do that on my OpenBSD severer? How do I apply updates on OpenBSD operating system?
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Sysadmin because even developers need heroes!!!

FreeBSD: Install sudo Command To Execute A Command As The Root

I have recently started to managing FreeBSD server along with Ubuntu Linux. However, sudo command, always shows me the following error:

zsh: command not found: sudo

How do I solve this problem and use sudo under FreeBSD 9.x system?
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