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Linux: Dell Server / Desktop / Laptop Find Out Service Tag Command

I need to find out the service tag of my Dell server or computer. How do I find out my nique five- to seven- digit alphanumeric (letter and number) service tag code without looking on the back of the system or opening door of bezel?
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Find Linux / UNIX Kernel Version Command

How do I find out what kernel version I am currently running under Debian Linux or any other Linux distribution using a shell prompt? How do I find out Unix kernel version?
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HowTo: Find Which Kernel Version Is Installed On My Linux System

I am a new proud Linux user. My question to you is - how do I find which kernel version installed on my Linux system? How do I upgrade my kernel to latest version? Any help would be greatly appreciated.
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