--The role of the shell and the Linux kernel
The shell acts as a bridge between the user and the Linux kernel.
(Example) The shell receives the character string entered by the user and interprets it as a command from the user. After that, the shell finds the command indicated by the input character string and submits it to the Linux kernel. When Linx Kanel finishes executing the command, Sur outputs the result to the user.
--What is a terminal?
Dedicated hardware used by users to input and output to a computer. The terminal and shell are separate software.
In the current Linux, the terminal as hardware is not used, and instead, a terminal emulator that implements the terminal as software is used. The terminal emulator is software that only provides input / output screens, and the shell runs inside the terminal emulator.
--Command collection for moving the cursor
| command | Contents |
|---|---|
| Ctr + b | Move one character backward |
| Ctr + f | Move one character forward |
| Ctr + a | Move to the beginning of the line |
| Ctr + e | Move to the end of line |
| Alt + b | Move one word backward |
| Alt + f | Move one word forward |
| Ctr + w | Delete one word at the end with one space delimiter |
--Troubleshooting command collection
| command | Contents |
|---|---|
| Ctr + s | Lock screen display |
| Ctr + q | Unlock screen display |
| Ctr + l | Clear screen |
| Ctr + e | Move to the end of line |
--Role of each directory
| Directory name | role |
|---|---|
| /bin | The minimum required for the operation of Linux systems, Contains commands of high importance |
| /dev | To access device drivers Stores the device file that serves as the interface |
| /etc | Contains files related to Linux settings, etc. This is an important directory for Linux management and operation. |
| /home | Home directory assigned to each user This is the directory where it is located. |
| /sbin | /Similar to bin, with executable files directory(Mainly commands for administrator users) |
| /tmp | A directory for temporary files |
| /usr | Executable file of the additionally installed application, The directory where documents, libraries, etc. are located |
| /var | This is a directory for storing changing data. Data and logs created when the application is running, E-mail etc. are stored in this directory. |
--ls command
| command | Contents |
|---|---|
| ls -a | Files in the current directory Display including hidden files |
| ls -F | Files in the current directory Display by type |
--File operation command collection
| command | Contents |
|---|---|
| mkdir |
Creating a directory |
| touch |
Create an empty file(If you want to create multiple files 続けてfile nameを入力すればいい) |
| rm |
Delete file(If you want to delete multiple files 続けてfile nameを入力すればいい) |
| rmdir |
Delete directory |
| cat |
Display the contents of the file. (By specifying multiple files, files can be concatenated and displayed.) |
| less |
It is used when you want to browse a file with long contents. You can scroll to see the contents. (Better than cat when looking at long content) 「/You can search for a character string in the file by entering "". |
| cp |
Copy the file |
| mv |
Move files |
--What is a link? (Hurdling, symbolic link)
A link is to give an alias to a file. (Something like a shortcut in Windows)
** Hard link **: A function to give multiple names to the entity of one file.
The entity of the file with the hard link is deleted when all the hard links are lost. (Does the linked file itself feel like a hard link?)
** Symbolic link **: A file in which the path name of the link destination is written. The link destination is the actual file and is a real file. Deleting a symbolic link does not affect the linked file. On the other hand, if the linked file is deleted, the symbolic link will be in a broken state. (Because there is no link)
| command | Contents |
|---|---|
| ln |
Creating a hard link |
| ln |
Creating a symbolic link |
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