Linux note_kernel basics and console

Linux notes _ KERNEL basics and console-general Linux technology-Linux programming and kernel information. For details, see the following. Author: the past

1. linux Structure

Kernel space:. kernel modles

User space: lib appliction shell Xwindow

The kernel is fixed. while modles can be added to support more hardware. kernel and modlese provide APIs for apps or shells. people can use SHELL or APP to control hardware and underlying data. A linux system does not require human-computer interaction (that is, it does not need to set or control the system. yes, no USER space is required. only the kernel and modules can be run.

2. kernel

Version: 2.6.25.9 -------------> 2.6 (major version) 25 (25th version) 9 (9th revision of 25 Version)

Location:/boot/vmlinuz2.6.25.9

Uname-a view the kernel version number

Ls/lib/modules/2.6.xxx/View module

L/lib/modules/2.6XXX/kernel/fs view supported file systems

2.6 ----------> stable version (even number)

2.5 ----------> test version (odd number)

2.4 ----------> old version (even number) stable version: there are also updates to meet the needs of old users. For example, some new bugs are fixed.

3. virtual console

TTY: Text console TTY0 indicates the first console TTY1 second

PST: Image console PST/0 indicates the first image Console

End the second graphic console process: SKILL-9 PST/2

Start the second graphics Console: stratx --: 1