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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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Configure BASH, KSH, TCSH, ZSH Shell To Logout User Automatically After Idle Time

tmout on a Linux/Unix shell
How can I configure the bash or ksh shell to logout any user automatically after a period of idle time under a Debian Linux or any other UNIX-like operating system?
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How Do I Find The Largest Top 10 Files and Directories On a Linux / UNIX / BSD?

How do I find the largest top files and directories on a Linux or Unix like operating systems?
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