Windows and Mac OS X are closed-source. That means you don't know the source codes. The problem is that if they have a security hole in the software, you have to wait till their developers find the bug and fix them, in that time many damages may have happened. Linux is open-source so any developer can access the code and fix it, edit it. So it's secure.
The other thing is in Windows, you have this thing called Administrator. When you're running as admin, you have the full authority, in the meantime apps running in admin also have the full authority. They can install other software, edit environment variables, etc. without your awareness. In Linux, you can't just create a admin account. Each time you want to run an administrative task, you have to enter password.
It's like this. You have 2 tasks. One is to add a user account and the other is to install a software. In Windows, these are administrative tasks which you have to have admin accounts. In Linux, when you want to add a user, you go to user panel which ask you the password. If you give it, then you can add a user, but can't install the app in the meantime. You have to separately give permission to that too.
P.S. OS X is build from Unix kernel so it's bit more secure than Windows.
Linux is considered to be more secure than Windows.
Security is a concept, not an application. You get security in Linux by making the system secure.
It's fast, reliable, and secure
Most Linux distributions are already secure. It would actually be more difficult to make them"unsafe."
because its free more secure less maintenance
It's process of making Linux even more secure. There are many ways to do that - from tweaking network policies to installing and configuring kernel security modules. For a desktop PC or a small home server, you don't need to worry about that since Linux is already secure enough by default.
Because Linux is highly stable and highly secure. One can generally turn a Linux server outward onto the Internet and not have to worry about it.
It's extremely fast, reliable, secure, configurable, and, in case of distributions like Ubuntu or Linux Mint - very comfortable to use.
Because it's: *Free *Reliable *Secure *Customizable
SSH.
SSH stands for Secure Shell. (Often shown as Secure SHell.) It is a secure method for a host computer to connect to a remote computer on the network or over the internet.
Linux shell is a programming language. its fully different from others progrmming language. the script which is used in Linux quite tough to remember if we comparison to other programming laguages.