Learn about knowledge before you learn Linux.

The 1,linux version number indicates:

Major.minor.release

Example: 2.4.4,3.10.18

2, Distributor:

Release version: Open source program +linux kernel

Slackware

Then derivative: SuSE

Debian

Then derivative: Ubuntu

Redhat

Then derivative: Centos (Community Edition)

Fedora

Archlinux,gentoo: Source code, can be automated according to the needs of optimization and customization, but the technology is more complex

3, Application interface:

Api:application Programming Interface Application Interface

Includes Syscall (System interface), Libcall (library interface), POSIX API (compatibility specification)

Program run Process: preprocessing ——— compiling ———— assembly ——— Connection

Abi:application binary Interface Application binary interface

corresponding platform executable format and supported libraries

If Windows follows POSIX api,linux also follows, programs developed in Windows based on a compatible API can be run on Linux that is compatible with the API, but window-developed programs are compiled in binary format and cannot be run on Linux

4, Free software:

Fsf:free software fundation asf:apche software fundation

1) free to learn, free to modify code

2) Source code can be obtained for any purpose

3) free distribution of source code

4) free to create derivative version

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Learn about knowledge before you learn Linux.