User accounts, files and directories, processes, system commands.
Linux for Engineering and IT Applications
What makes Linux different from traditional Unix
GNU Public License (GPL) for the Kernel and OS applications:
free to use; get the source; develop and disclose your source.
The same Kernel and GNU C libraries (glibc) for different distributions:
if you can run an application on one kind of Linux, its a matter of setting
libraries to run it on the other distribution.
Runs on various computer architectures: x86, SPARC, MAC, IBM, DEC.