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Linux / Unix: Check Last Time User Logged In On The System

I am a new Unix system admin. How do I find ouw who has recently use the Linux or Unix-like server? Which terminals they used, and when they logged in and out of the my server?
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FreeBSD 9.1: HowTo Load a Kernel Module

I am a new FreeBSD Unix users. I am using FreeBSD version 9.1 and how do I load a kernel module called drm using command line option?
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Linux / Unix: Bash Shell See All Exported Variables and Functions

How do I see a list of all exported variables and functions under Unix bash shell?
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Unix / Linux: Save Output To File

I am new Linux and Unis shell user. In Unix or Linux, how do I save outputs in an external file say data.txt?
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Edit a File When You Are Viewing It Using more / less Command Pager

I can use less or more pagers to view a file. How do I start an editor (such as vi or other text editor) to edit the current file without leaving the less or more pager command?
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