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host name

How do I change the hostname of a Debian Linux system permanently using the command line tools?
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Linux: Find Out My Machine (Host) Name

How do I find out my server name (machine name) under Linux operating systems using command shell?
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Q. I've 3 corporate domains registered with Go Daddy. Recently we setup our own nameserver using BIND9 under Linux. My setup is as follows:
example.com domain

However, when I try to change nameserver using Go Daddy domain control panel, I get an error that read as follows:

Errors were detected.

How do I configure my server to avoid errors?
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OpenBSD Change Hostname

Q. How do I change my hostname under OpenBSD operating system?
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Ubuntu Change IP

Q. How do I change IP address under Ubuntu Linux using GUI and command line options?
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Q. How do I find out which service is listening on a specific port? How do I find out what program is listening on a specific TCP Port?
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Monitor Linux user activity in real time

Q. How do I Monitor Linux User Activity in real time?

A. The whowatch program scans the most current common log file of Linux server and creates the following statistics in real time:

=> The users currently logged on to the machine, in real-time.
=> User login name,
=> User tty
=> User host name
=> User's process
=> The type of the connection (ie. telnet or ssh)
=> Display of users command line can be switch to tty idle time.
=> Certain user can be selected and his processes tree may be viewed as well as tree of all system processes.
=> Kill user process etc

I have already written how to install and configure whowatch. Please refer this previous article.