the linuxcounetr shows :
At 13/07/2012 09:50am, there are 132,975 users and 93,716 machines registered.
linuxcounter guess at the number of
Linux users:61,127,934
World population: 7,065,924,037
internet users: 2,397,173,905
This isn't possible to answer with any certainty. Many companies contribute to the Linux kernel and may pay developers internally, but have only one person upload to the mainline tree. Some Linux developers may also receive patches from contributors who do not have git access.
Approximately 10,000 developers throughout the world have worked on Linux. Linux was originally released in 1991. Its mascot is a penguin named Tux.
Many Linux distributions are intended for home users.
It has over 498750565 members worldwide
This is the problem, no one really knows. Unlike Windows or OS X, Linux doesn't really have you "register" or phone home to anyone, so no statistic on how many Linux users there are is accurate. I personally estimate Linux users number at least as much as OS X users, though many will not agree with me.
1 million
Linux and the many variations based on Linux (Ubuntu, Mint, to name but two) are aimed at any one who wishes to use it, and is available for free.
Many Linux users find the command line quicker than using the Graphic User Interface (GUI).
The 2.6 Linux kernel supports up to 4,294,967,296 user IDs. The 2.4 kernel only supports 65,536.
The users and developers.
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No accurate figure can be given, though there are many millions.
In general Linux has no restrictions on the number of users in a server. Commercial Unix vendors vary in what they allow by licensing, so it depends on the vendor.
Finding software to help run cloud computing Linux can be difficult for some people. If you are new to using the Linux operating system, you may not know where to find the best computer networking software. Many software stores carry only a few networking software tools for Linux operating system users. If you look for software online, there are many more products for Linux users are retailers on the internet.