#14: Using screen
If you work on remote servers via SSH and don't want to open multiple connections, or if you don't have a graphical terminal emulator and don't want to open several concurrent ttys, screen is the right tool for you.
#13: Printable vim cheat sheets
Vi and its successor vim are both very mighty and well known tools. Some love them, some hate them. But overall, they're complex. If you are about to learn vim, it's probably a good idea to have a well arranged cheat sheet or reference card of the most important keyboard commands. It's not very difficult to find one, there are hundreds of thousands of cheat sheets, but many consist of HTML tables and are ugly or confusing. Only a few are really suitable for printing and having them on the desk
#12: Restarting web server gracefully
After upgrading your web server you need to restart it, but how is this done correctly? Just killing the server would interrupt all connections and that could cause problems such as inconsistent data and angry users. So what we need to do is to restart the web server gracefully so that all connections being served can finish. Once all connections are closed, the server restarts.
#11: Understanding Linux man pages
man is probably one of the most used Linux commands at all. Less known, however, is that man is more than just man.
#10: Using xargs
One very helpful tool that exists on many Unix-like systems is xargs. xargs is built to receive standard input (STDIN) and pass it as command-line parameters to a specified command.
#9: Solving “Flash in background issue”
Since Adobe has introduced Flash, there have always been major and minor problems with that on all platforms, especially on Linux. One problem I often had to deal with is a focus stealing bug with Kwin, KDE's window manager.
#8: Advanced usage of grep
grep is probably one of the best known, or let's better say: the most used command line tools on UNIX systems. But not many people know that it is so much more than just a very simple text search command.
#7: Job control and background processes
Linux is a multitasking operating system, so you can execute several programs at once. It is also possible to make use of this on the console.
#6: Network based RAID-1
You are probably familiar with RAID-1, which is a mirroring technique for synchronizing data between two or more disks for the sake of redundancy. Normally, RAID-1 mirrors data between several local disks, but you can also sync them over Ethernet. This is not conventional RAID-1 but at least comparable.
#5: Be careful with locate
When locating files on your disk locate is a nice tool because it indexes your hard drive and therefore finds files very quickly. But locate can also be a great security threat to your system.
#4: Cut your use of cat
All Linux administrators know this tool and some make use of it very often: cat. Also Linux beginners get to know this quickly and use it a lot. Most people love it so much that they utilize it in every situation whether it's needed or absolute nonsense.
#3: Get more loop devices
Loop devices on Linux are virtual devices which can be used to mount files like real devices. For historical reasons you have 8 such loop devices by default, but in current Kernel releases you can of course use more than just 8.
#2: Simple but useful: tee
One little tool which's often overlooked is tee. It is very smart and can help you so much. tee is a typical UNIX program. It can't do much and has been created for only one purpose: writing STDIN to STDOUT and a file. That doesn't sound very exiting yet but this simple tool can do a lot for you.
#1: Last commands on Bash
You probably know the bash history function. All commands you entered are stored in memory and will be written to ~/.bash_history as soon as you exit your current shell. You may have used this often by tapping the up and down arrow keys to repeat the last few commands. But did you know that bash can do much more history work for you?
Dr. Frankenlinux or how to create zombie processes
Processes are a very complex but important topic for understanding how Linux works. Covering all details about process management in Linux wouldn't be possible for one blog post, but let's have a bit of informative fun with process creation and especially with their deletion. It's Halloween and which topic could be more appropriate than birth, death and undeads? 
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