The 2.6 Linux kernel supports up to 4,294,967,296 user IDs. The 2.4 kernel only supports 65,536.
Many Linux distributions are intended for home users.
IPCop, a firewall software geared toward Linux SOHO users, can be downloaded from the IPCop website. It was created by Linux users who were unhappy with the existing firewall availability.
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.
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 users and developers.
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
Linux For You was created in 2003.
Every user of Linux is belonging to at least one group. GID (Group ID) is used to identify the group. A group can have many users. Also whenever a user is created in Linux a Group is created with the same name. You can find group information in /etc/group file. To display contents of file use command cat /etc/group
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.
PenLUG is: Peninsula Linux Users' Group.