"Self-learning Linux" Linux operating system and common commands

1. Command Prompt
#: Root
$: Normal User

2. Command Format
[command option parameter]
Options:
Short Options:-
Multiple options can be combined:-a-b =-ab
Long options:--
Parameters:
Action object of the command

3. User Switching
Command format:
[SU user name]

4. Common Commands
Pwd:printing Working Directory
Show Current Location

Ls:list List
-L: Long format
File type
-: Normal files (file)
D: Catalog files (directory)
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, each 3-bit group, each group: rwx (Read, write, execute)
Number of hard links to files
Owner of the file
Genus Group of files
File size (size), in bytes
Timestamp (timestamp): Last Modified Time
Access: Access
Modified: Modify, the file content has changed
Change: change,metadata, meta data
-H: Do unit conversions
-A: Displays all directories, including the. Start with hidden files and normal files
. Represents the current directory
.. Represents the parent directory
-A: Show only hidden directories
-D: Display the directory's own properties
-i:inode No.
-R: Reverse Display
-R: Recursive (Recursive) display

Cd:change Directory
CD ~username: Enter the home directory of the specified user
CD-: Switch back and forth between the current directory and the previous directory

Type: shows what kind of instruction it belongs to
Command type:
Built-in commands (shell built-in)
External command: There is an executable file corresponding to the command name in a path on the file system

Date: Time Management
System clock
[Date MMDDHHMM[[CC]YY][.SS]]

Hwclock: Hardware Time
-W: Hardware time synchronization system time
-S: System time synchronization hardware time

Cal:calendar Viewing calendars
[Cal MOUTH Year]

5. Get the use of commands to help:
Internal command:
[Help COMMAND]
External command:
[COMMAND--help]
Command manual: Manual
[Man COMMAND]
Command chapters:
[Whatis 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
... : multiple times can occur
|: Choose one More
{}: Grouping

Mans:
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
BUGS:
EXAMPLES: Using the example
See ALSO: Another reference

Flip Screen:
Turn back one screen: SPACE
Turn One screen forward: b
Turn back one line: ENTER
Turn One line forward: K

Find:
/: Find backwards
N: Next
N: Previous
?: Find Forward
N: Next
N: Previous

Online Documentation:
[Info COMMAND]

Help Documentation Catalog:/usr/share/doc

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"Self-learning Linux" Linux operating system and common commands