In Linux, "gc" usually refers to "Garbage Collection", the abbreviation of garbage collection. Garbage collection solves the problem by automatically detecting memory that is no longer used by the program and automatically releasing it at the appropriate time. The problem of manual memory management is that the garbage collector will track the reference relationships between objects, mark live objects, and then clear unreferenced objects to make them recyclable garbage.
The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.
In Linux, "gc" usually refers to the abbreviation of "Garbage Collection". Garbage collection is an automatic memory management technology designed to help programmers solve memory management problems.
When developing in a programming language, it is often necessary to manually allocate and release memory to manage the program's memory usage. However, manual memory management may lead to memory leaks, dangling pointers and other problems, causing program instability and waste of memory resources.
Garbage collection solves the problem of manual memory management by automatically detecting memory that is no longer used by the program and automatically releasing it when appropriate. The garbage collector tracks the reference relationships between objects, marks live objects, and then clears unreferenced objects so that they become recyclable garbage.
In Linux, many programming languages have implemented garbage collection mechanisms, such as the garbage collector in Java's JVM (Java Virtual Machine), Python's garbage collector, Ruby's garbage collector, etc. These garbage collectors are responsible for automatically managing the memory allocated to the program, reducing the need for programmers to do explicit memory management.
Garbage collection plays an important role in improving program reliability, reducing the risk of memory leaks, and reducing programming workload.
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Maintenance mode plays a key role in Linux system management, helping to repair, upgrade and configuration changes. 1. Enter maintenance mode. You can select it through the GRUB menu or use the command "sudosystemctlisolaterscue.target". 2. In maintenance mode, you can perform file system repair and system update operations. 3. Advanced usage includes tasks such as resetting the root password. 4. Common errors such as not being able to enter maintenance mode or mount the file system, can be fixed by checking the GRUB configuration and using the fsck command.

The timing and reasons for using Linux maintenance mode: 1) When the system starts up, 2) When performing major system updates or upgrades, 3) When performing file system maintenance. Maintenance mode provides a safe and controlled environment, ensuring operational safety and efficiency, reducing impact on users, and enhancing system security.

Indispensable commands in Linux include: 1.ls: list directory contents; 2.cd: change working directory; 3.mkdir: create a new directory; 4.rm: delete file or directory; 5.cp: copy file or directory; 6.mv: move or rename file or directory. These commands help users manage files and systems efficiently by interacting with the kernel.

In Linux, file and directory management uses ls, cd, mkdir, rm, cp, mv commands, and permission management uses chmod, chown, and chgrp commands. 1. File and directory management commands such as ls-l list detailed information, mkdir-p recursively create directories. 2. Permission management commands such as chmod755file set file permissions, chownuserfile changes file owner, and chgrpgroupfile changes file group. These commands are based on file system structure and user and group systems, and operate and control through system calls and metadata.

MaintenanceModeinLinuxisaspecialbootenvironmentforcriticalsystemmaintenancetasks.Itallowsadministratorstoperformtaskslikeresettingpasswords,repairingfilesystems,andrecoveringfrombootfailuresinaminimalenvironment.ToenterMaintenanceMode,interrupttheboo

The core components of Linux include kernel, file system, shell, user and kernel space, device drivers, and performance optimization and best practices. 1) The kernel is the core of the system, managing hardware, memory and processes. 2) The file system organizes data and supports multiple types such as ext4, Btrfs and XFS. 3) Shell is the command center for users to interact with the system and supports scripting. 4) Separate user space from kernel space to ensure system stability. 5) The device driver connects the hardware to the operating system. 6) Performance optimization includes tuning system configuration and following best practices.

The five basic components of the Linux system are: 1. Kernel, 2. System library, 3. System utilities, 4. Graphical user interface, 5. Applications. The kernel manages hardware resources, the system library provides precompiled functions, system utilities are used for system management, the GUI provides visual interaction, and applications use these components to implement functions.

Linux maintenance mode can be entered through the GRUB menu. The specific steps are: 1) Select the kernel in the GRUB menu and press 'e' to edit, 2) Add 'single' or '1' at the end of the 'linux' line, 3) Press Ctrl X to start. Maintenance mode provides a secure environment for tasks such as system repair, password reset and system upgrade.


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