02-01-linux operating system and common commands

Gnu:gnu is not UNIX.

Gpl:general public License, general license, copyright

Shell

Gui:graphic User Interface

Windows

X-windows

Gnome

Ide

Xface

Cli:command Linux Interface

Sh

Bash

Csh

Ksh

Zsh

Tcsh

IDE: Integrated development environment

Dll:dynamic link libary (dynamic link library)

So:shared object (Shared Object)

Login

User name: Unique user ID

Authentication mechanism: Authentication

Authorization: Authorization

Audit: Audition (log)

Prompt, command prompt:

Command:

Magic Number: Magic Numbers

#!/bin/bash

#command Options ... arguments ...

Options:

Short options

Long options

Parameters:

Lit:ls

Lists, lists

List files under the specified path

Directory: file, path mapping file

Path: The location that passes from the specified starting point to the destination

FileSystem: The mechanism of FileSystem hierarchical directory management structure

Absolute path: The location that passes from/to the current directory

Relative path: The location that passes from the current directory to the target directory

Pwd:print working directory (show current working path)

Ls

-L: Long format, display full information

File type: the

-: Normal file (f)

D: Catalog file

B: Block device files (blocks)

C: Character device file (character)

L: Symbolic Link files (symbolic link file)

P: Command pipe file (pipe)

S: Socket file (socket)

File permissions: 9-bit, every 3-bit group, each group: rwx (Read, write, execute), r--

Number of hard connection files

The owner of the file (ower)

Genus Group of files

File size (size), default unit is byte

Time stamp (timestamp) explicitly is the last time that was modified (three timestamps per file)

Access: Access

Modified: Modify, File content changed

Change: change,metadata, meta data

-H: Do unit conversions

-A: Hidden files that explicitly start with.

.: Current Directory

.: Top level directory of current directory

-A: Explicit all hidden files, but excluding current directory and parent directory

-D: Display the directory's own properties

-i:index Node,inode Display Index node number

-R: Explicit in reverse order

-R: Recursive explicit (recursive)

Cd:change Directory

No parameters (or ~): Go back to the user's home directory, home directory

CD ~username: Enter the home directory of the specified user

CD-: Switch back and forth between the current directory and the previous directory

Command type:

Built-in command (shell built-in) internal, built-in

External command: There is an executable file corresponding to the command name in a path on the file system

Environment variable: the memory space of the command

Assigning values to variables

Name=jerry

Path: a bunch of paths separated by colons

Type: Shows what types of commands are (built-in or external)

Hash: The number of times the command is cached and the directory in which the command resides

This article is from the "Lemon" blog, be sure to keep this source http://xianglinhu.blog.51cto.com/5787032/1620347

02-01-linux operating system and common commands