20141206 Study Notes

Basic principles of Linux:

1, consisting of a small program with a single purpose; a combination of small procedures to complete complex tasks;

2, all documents;

3, try to avoid capturing the user interface;

4, the configuration file is saved in plain text format;

Command prompt, Prompt,bash (shell)

#:root

$: Normal User

Command format:

Command option Parameters

Options: Short Options-Multiple options can be combined:-a-b =-ab; Long option--

Parameters: The Action object of the command

Virtual Terminal (terminal): Ctrl_+atl+f1-f6

User switch command: su [-l] User name

Change Password command: passwd original password New password

Gui:gname KDE Xface

Cli:sh bash CSH ksh zsh tcsh

LS: Lists files under the specified path

-L: Long format

File type: the

-: Normal file (f)

D: Catalog file

B: Block device files

C: Character device file

L: Symbol Connection File

P: Command Pipeline file

S: Socket file

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

Number of hard links to files

The owner of the file

Group of files

File Size: Unit bytes

Timestamp: The last time it was modified

Access: Access

Modified: Modify, File content changed

Change: change,metadata, meta data

-H: Do unit conversions

-A: Show hidden files starting with.

. Represents the current directory

.. Represents the parent directory

-A

-D: Display the directory's own properties

-i:index Node,inode

-R: Reverse Display

-R: Recursive display

PWD: Show work current directory

Cd:

CD ~username: Enter the designated home directory

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

Command type:

Built-in commands (shell built-in)

External command: There is a command name corresponding executable file under a path in the file system

Type: display specifies which type to belong to

Environment variables: named memory space

Name=jerry

Path: Paths separated by colons

Date: Time Management

Get command Use Help

Internal Command help command

External command--help

Command manual: Manual

Whatis command to see which chapter

Man:command

Sub-chapters:

1: User command (/bin,/usr/bin,/usr/local/bin)

2: System call

3: Library User

4: Special files (device files)

5: File Format (configuration file syntax)

6: Game

7: Miscellaneous (Miscellaneous)

8: Management Command (/sbin,/usr/sbin,/usr/local/sbin)

<>: Required

[]: Optional

...: can occur multiple times

| : Choose one More

{}: Grouping

Name: command names and features brief description

Synopsis: Usage notes, including available options

DESCRIPTION: A detailed description of the command function, which may include the meaning of each option

Options: Explaining the meaning of each option

Files: The configuration file associated with this command

BUGS

EXAMPLES: Using the example

See ALSO: Another reference

Flip Screen:

Turn back one screen: SPACE

Turn One line forward: b

Turn back one line: ENTER

Turn One line forward: K

Find:

/keyword: Backwards

N: Next

N: Previous

? KEYWORD: Forward

N: Next

N: Previous

Q: Exit

Hwclock

-W: System time to hardware time

-S: Hardware time to System time

Online Brochure

Info COMMAND

Document:/usr/share/doc

Cal: Calendar

20141206 Study Notes