Mac OS X is based on BSD, which is similar to Linux. Because of this, it is fairly easy to port programs between the two operating systems. However, the two operating systems are not the same, and programs for one don't work on the other. Linux also uses the X window system, and Mac doesn't, though Mac has a program to support programs that use the X window system. Because of this, Linux programs can be configured to run on Mac OS X with a little elbow grease, but not the other way around.
Not exactly. Both Mac OS X and Linux are flavors of Unix, so they're very similar, but they're not identical.
Yes.
mac os
Linux is free. Windows and Mac OS X are not
Mac OS X uses a Mach kernel and FreeBSD utilities at it's core.
linux, windows, mac OS x,
They are all operating system.
Windows, Linux, Mac OS X
OS X was forked from the FreeBSD 2.x/3.x branch. with kernel mods and the quartz userland. the various OS X releases have corresponding FreeBSD releases. it uses the FreeBSD mach microkernel with os9 compatibility. Darwin is the development builds of OS X versions. the FreeBSD guys backport OS X tech into their OS. OS X is opensource aside from the quartz userland. OS X also includes kernel components from the NeXT step operating system.
The Mac OS can be installed on ANY HD that Windows or Linux can, it's just the Formatting that may need to be changed.
Formatting the drive would remove any files currently on it. If you want to access a Linux file system from Mac OS X, there are a few programs that can do this, such as Paragon ExtFS for Mac OS X or ext2fsx.
No, Opera's servers run on Linux.
There are versions of the FireFox browser available for the Linux, Mac OS X and Windows operating systems.