Figure 1. Operating System
2. Process
- The default daemon
- The program will start its own program process - a normal process
Note:
- Most common processes are not directly through System call to call hardware resources, they need the help of library files , to run properly on your system.
- System call: the channel is user space and kernel space
- .dll are windows in the library
- .os is in the linux library file
- shell is interactive management of the operating system
- ssh remote login session
3. Structure of the operating system
4. Operating system development history
The copyright kernel and GNU / linux of
Common Issuer versions: centos (no charge), redhat (service charge), fedore, opensuse (Europe), debian (safety), ubuntu (the desktop), unicorn, red flag
6. Open Source System
(1) GNU: full name (GNU is not unix)
GNU Project: The commercial version of the open source software program
GPL agreement: open source software code if you plan to use the GNU defined, you have all the code corresponding to be open source
(2) BSD
(3) Apache: do site started community, hadoop project after 2000, top-level project called Apache project
7.centos installation process
(1) directly to the operating system installed on a hardware device (not recommended)
(2) using the VMM management platforms (VMware workstation, Virtualbox) installation (VM mode)
(3) the selected language, select Keyboard, select the time zone, writing the host name, define the root password (superuser), dividing up the disk space (boot (boot partition), swap (swap partition), / (root partition))
(4) recovery initialization (can be used in a system problem occurs): VM - Snapshots - to take snapshots - name (initialization state) - Shooting
8. The common command linux
