Linux Operating System Basics

Gui;graphic User Interface GUI

Windows

X-window

Gnome

Kde

XFace

CLI; Command Line Interface

Ah

Bash

Csh

Kah

Zsh

Tcsh

The structure of the operating system is at the bottom of the hardware and then the kernel

Ide

. So shared objects

Login

User name; user ID

certification mechanism; authentication

a auhorization of authority;

Audition most general-purpose logs complete

Prompt; command prompt

Command:

Magic Number: Magic Numbers

Shebang

#!/bin/bash, this is the magic number.

# command Cptions arguments

Options

Short options

Long options

Parameters

List is

List lists

List files under the specified path

A directory is also a file path mapping

Path refers to the location from the specified starting point to the destination lock

file system; Files Ayatem

Directory: working directory or current directory

Pwd Print Woyking Directory

Ls

-L Long format

File type;

-: Normal file (f)

D: Catalog file

B: Block device files (blook)

C: Character device file (character)

L: Symbolic Link files (aymbolic link file)

P: Command pipe file (pipe)

S: Socket file (socket)

File permissions: 3-bit: Every 3-bit group, each group: rewx (Read and write execution) r--

Number of file connections

The owner of the file

Group of files

The size of the file is the default unit of bytes

Timestamp: The time of the most recent first modification

Access: Access

Modified: Modify

changing: Change matadata metadata (root)

-H Do unit conversions

-A shows hidden files starting with.

. Represents the current directory

.. Represents the parent directory

-A

-D; Show directory self properties

-i;index node Inode

-R; Reverse Display

-R; Recursive (reursive) display

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Linux Operating System Basics