How to send a message from command line to an url

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There are several applications, including monitoring solutions, which are able to interpret a json or any other type of message if sent correctly and according to each application's rules.

The way to do this is limitless but I will present you below only 2 methods. They have as example a json message.

With curl

Curl is able to send any message you want and json is not exception. The only thing is some application require certains http headers and others must not get anything but the message.

Linux: CPU usage vs. load average

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No matter the monitorization solution, CPU utilization is important but if you really want to know what is happening with your system, you should look at load average. I will explain below why.

The current CPU utilization does not reflect the actual load of the system because when a host is heavily loaded, its CPU usage doesn't have to be necessary close to or at 100%.
Furthermore, the CPU utilization tends to generate (in monitoring tools) a significant number of false alerts, even if the percentage alert is close to 100%. Explanation follows.

Ransomware KeRanger attached to Transmission app

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Do you use Transmission?
If yes, I suggest you check your version and update it soon. There are reports that a specific version has been tampered with.

IMAGE(https://mediashow.ro/source/446293)

Over the weekend, the first instance of Mac ransomware was found in a malicious update to the Transmission BitTorrent client. Version 2.90 of Transmission downloaded from the Transmission website was infected with "KeRanger" ransomware.

iMessage “Waiting for Activation” Error on iPhone

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There are many tutorials over the web regarding this problem but unfortunately it is not always the same for everybody.

In my case I have tried all the links below unsuccessfully (for you it might work):

https://support.apple.com/en-us/HT201349
http://www.idownloadblog.com/2014/05/14/how-to-remove-a-phone-number-from-imessage/
http://www.igeeksblog.com/fix-imessage-waiting-for-activation/

also you can try more:
https://duckduckgo.com/?q=imessage+waiting+for+activation&t=osx

Citrix Xen: Command Line Tips & Tricks

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How to get the Citrix XenServer version:

[root@XenGz ~]# cat /etc/redhat-release
XenServer release 6.5.0-90233c (xenenterprise)
[root@XenGz ~]# xe-linux-distribution 
os_distro="xenserver"
os_majorver="6"
os_minorver="5"
os_uname="3.10.0+2"
os_name="XenServer release 6.5.0-90233c (xenenterprise)"

How to list the vhd partitions and get the corresponding snapshosts (if any):

Citrix Xen: How to "migrate" VHD lv from one XEN to another without export/import but with dd command

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Citrix Xen has a way to migrate the machines from one host to another via xe vm-export and xe vm-import commands but there are situations when this won't work.
For example, if the source disk is in bad shape and there are bad (unreadable) blocks on your vm's disks, the xe vm-export command will be unsuccessful with the following error:

Citrix Xen: How to show vm information via command line

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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.

Citrix Xen: How to create VM and install Operating System via command line without XenCenter

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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

OSX: rEFIt is working with SIP enabled!

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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.

OSX: Launchd Tips, Tricks and examples

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Launchd is designed to start System and Users daemon/agents located in the following places:

~/Library/LaunchAgents - Per-user agents provided by the user
/Library/LaunchAgents - Per-user agents provided by the administrator
/Library/LaunchDaemons - System-wide daemons provided by the administrator
/System/Library/LaunchAgents - Per-user agents provided by Mac OS X
/System/Library/LaunchDaemons - System wide daemons provided by MAC OS X

OSX: Command line tool for temperatures and fan sensors

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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.

OS X: Add rc.local and Launchd entry for it

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Prior to OS X 10.10 Yosemite, you were able to start rc.local script via rc..
That is gone and you have to use launchd.

This tutorial assumes you have already your rc.local script in (example) /etc/rc.local and it is executable and properly populated with your desired commands.
So, without writing too much, below is my example of launchd script:

OS X: Disable Automount for a Specific Partition

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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

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