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How To: Upgrade CentOS Linux 5.3 to v5.4

How do I upgrade CentOS Linux from version 5.3 to latest version 5.4 over the Internet?
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FreeBSD: IPv6 Configuration Set Prefixlen Value

How do I set the prefixlen for an IPv6 address under FreeBSD operating systems?
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Mac OS X Start / Stop Apache Web Server

How do I start or stop Apache web server using shell prompt option under Apple OS X UNIX operating systems?
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Clear Shell History In Ubuntu Linux

How do I clear the shell history in Ubuntu Linux?

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Ubuntu Uninstall deb Package

How do I uninstall deb packages under Ubuntu Linux using GUI or CLI (command line) methods?
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Find Linux Kernel Version Command

How do I find out my Linux kernel version? How can I find the kernel version at shell prompt on Linux?
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Linux / BSD Shell Doesn't Recognize Newly Installed Binaries

I've installed few software using tar ball format under Linux or FreeBSD ports using make command. However, my system doesn't recognize the installed command. I've to reboot the system or log out and log in again to use the same. How do I fix this problem?
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UNIX Create User Account

How do I create a user account under UNIX operating system and assign a password to user account so that he / she can login into server or UNIX workstation?
Answer to “UNIX Create User Account”

xargs: How To Control and Use Command Line Arguments

I am trying to use xargs command using shell pipes and not able to understand how to control and use command line arguments. For example I'd like to find out all *.c file located in 100s of sub-directories and move them to another directory called ~/old.src. How do I use command line args with xargs to achieve the same?
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Solaris UNIX: Show Network Routing Table Information

How do I show networking routing table information under Solaris UNIX operating systems using a shell prompt?
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