Many times you can find difficult to perform simple tasks if you do not have the appropriate documentation, or you are not searching it correctly :)
It happened to me the other day: I had to rename a vm in Citrix Xen without XenCenter. After few readings, I discovered!
Read on.

I know, you have XenCenter and everything is easily done from there.
But what happens if you are not able to use it? Time to fire up the command line :)
In the example below, we will change the memory from 256M to 1G.

I was forced the other day to shutdown a machine via command line and my surprise was to get an error during the execution: VM didn't acknowledge the need to shutdown.
The error is quite convincing and full of useful stuff (NOT) but it's there and you cannot get past it without some extra parameters.
Read on for the solution.

In this article, I will show you how to install (any) operating system via command line in Citrix Xen. And without too much comment, read on!

Create a VM from the Debian Lenny template. Output should be the VM's UUID:

xe vm-install template="Debian Wheezy 7.0 (64-bit)" new-name-label=debian

I don't remember exactly when I have installed rEFIt (I did it only once) but I know I am using it without any problems since around 2006 and it went trough 2 laptops and several OSX versions already. The beauty of OSX upgrades and Time Machine.

After installing El Capitan, I was still using it without problems (well, just a small one but no biggie - will be mentioned a bit later), but also with SIP enabled! Will explain about SIP too.

You have a bunch of applications designed to show you temperatures and fan speeds in graphical environment. Some are free but most of them are paid.
But what happens if you need something in command line? Well, it is even better because you can find many free powerful tools.
One of them is iStats. Below you will learn how to install and use it.

In order to do this, you have to fire up a bit of terminal. If you are not familiar with the underlines of UNIX, you should document yourself more before proceeding.

So, I have a partition which I do not want to be automatically mounted on reboot because it is used by one virtualbox machine.
1. List the partitions with diskutil command:
mini:~ osx$ diskutil list

For this example I will user md5 but in similar way you can use whatever you want in order to create a hash version of your text password.
As a security note, I do not recommend using md5 to generate hash passwords because today it is very easily broken. This is jut a proof of concept.

I got this SMF forum for my wife and is working very well. I am very satisfied with SMF.
However, sometimes you get into trouble with it and the worst part is you do not have much logs to work with. Also, apache logs won't help much either.

So, below you will find things I encountered.

AIO subsystems in 6.1 and later are loaded by default and not activated. It is implemented as kernel service instead of using special device aio0 as in previous AIX versions. The kernel module tuning (maxservers, minservers, etc.) is implemented via ioo command.
In order to check the available aio tunables, you must use the following command:
# ioo -L | grep aio

The moment application initiates the AIO I/O requests, the subsystems are automatically started.