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[Linux] day02--what is Linux

Source: Internet
Author: User
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what is Linux? an operating system
Computer = hardware + software
System software = kernel + driver
Application software Programming Internet

Linux system composition
Linux kernel
Basic library applications
-------------------
Common operating systems
Windows Win7
Unix FreeBSD Sun Solaris HP UX IBM AIX
Linux Redhat Centos Fedora Debian Ubuntu

==========
GNU
GPL general public Licence allows users to copy and transfer changes and re-release
LGPL Lesser general public Licence allow unfair Open source code
-----
Linux distributions : A complete Linux system Linux kernel + various free software
---------
Linux operator Interface
User Login root (super Admin)
Character Interface CLI command line
Switching between consoles
Figure-Word Ctrl+alt+fn
Word-word Alt+fn
Word-figure Alt+f7
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Pseudo-character terminal ----Open terminal

[Linux] day02--what is Linux

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