Common commands and time file management

Commands include internal commands and external commands. the command format is case sensitive. internal Command: Command Prompt. There is no external command corresponding to the executable binary file in a shell. The command format is executable: # command [options] [arguments] [options]: parameters for executing the conversion command: 1,

Command:

Commands are divided into: Internal commands and external commands. \ 'command formats are strictly case sensitive \'.

Internal Command: Command Prompt. There is no executable binary file corresponding to a shell.

External command: an executable binary file is available.

Format: # command [options] [arguments]

[Options]: conversion Command Execution Method

Parameters: 1. Short options:-l,-h,-lh 2. long Options: -- help, -- long (documentary word)

[Arguments]: target object of the command

 

 Which: View the command location

Type: view the command type

History: View command history

! N: run the nth command.

! + (String): Indicates executing the latest command starting with this string.

!! : Execute the previous command

! -N: Execute the nth command.

! $: Reference the last parameter of the previous command.

Common commands:

Cd: Change Directory switch to the current user's home Directory without any parameters

 Pwd: Printing Working Directory: displays the Working Directory

Cd-Indicates switching between the current directory in the previous directory

Cd ~ Switch student to the student's home directory

Cd... cut to parent directory

Ls: Parameter ::

-L displays the file details.

-H: easy to read.

-A: All files are displayed.

-A does not display the "." "..." directory.

-D: displays the directory attributes.-r is sorted in reverse order.-R recursively displays the files in each subdirectory.