What does single mean in linux?-Linux Operation and Maintenance-php.cn

Home

Operation and Maintenance

Linux Operation and Maintenance

What does single mean in linux?

little bottle

May 29, 2019 pm 05:42 PM

linux

The commonly used startup methods under Linux include single-user mode, ordinary multi-user mode, complete multi-user mode and XWin mode. Today I will talk to you about single-user mode (single).

What does single mean in linux?

In Linux, single refers to single-user mode.

So what is single-user mode?

In single-user mode, the system is not fully running, only some programs are running, and you cannot remotely log in to the Linux system at this time.

Entering the single-user mode for system maintenance is completed by the ROOT user, and it is entered directly from the ROOT without password verification.

At this time, the ROOT user has full operating authority over the system. While repairing the system, it can also destroy the system at any time.

How to enter single user

1) Set the uboot environment variable and add single;

2) Floppy disk boot

When "BOOT:" appears after the floppy disk starts, you can set the startup parameters. After typing "Linux single" here, you can start the system in single-user mode.

3) LILO mode

When starting in LILO mode, after the LILO prompt appears, you should quickly enter kernel/boot/vmlinuz-2.4.7-10 single roo =/dev/hda3, here I use REDHAT7.2, the kernel is 2.4.7-10, the general file name is vmlinuz when using it, you can copy this kernel file or establish a connection when the system is normal. single means single use. root=/dev/hda3 is the location of the root of the Linux system. My computer is equipped with 98, if it only has Linux. It may be /dev/hda1. On the second hard disk, it is /dev/hdb1. Here is how Linux identifies partitions.

4) GRUB method

This method is more complicated to boot. When entering the GRUB startup screen, press "C" to enter the GRUB command line. , press "P" when there is a password, enter the password, and then enter the GRUB command line.

Enter the following command on the command line to enable single user. I still use REDHAT7.2 as an example to illustrate kernel /boot/vmlinuz-2.4.7-10 single root=/dev/hda3initrd/boot/initrd -2.4.7-10.img boot (hd0,2) The first and second sentences indicate the kernel file. The keyword for single user is still single. Depending on the system, the file name may be different. boot (hd0,2) means booting from the third partition of the first hard disk.

The above is the detailed content of What does single mean in linux?. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

The 5 Core Components of the Linux Operating SystemMay 08, 2025 am 12:08 AM

The five core components of the Linux operating system are: 1. Kernel, 2. System libraries, 3. System tools, 4. System services, 5. File system. These components work together to ensure the stable and efficient operation of the system, and together form a powerful and flexible operating system.

The 5 Essential Elements of Linux: ExplainedMay 07, 2025 am 12:14 AM

The five core elements of Linux are: 1. Kernel, 2. Command line interface, 3. File system, 4. Package management, 5. Community and open source. Together, these elements define the nature and functionality of Linux.

Linux Operations: Security and User ManagementMay 06, 2025 am 12:04 AM

Linux user management and security can be achieved through the following steps: 1. Create users and groups, using commands such as sudouseradd-m-gdevelopers-s/bin/bashjohn. 2. Bulkly create users and set password policies, using the for loop and chpasswd commands. 3. Check and fix common errors, home directory and shell settings. 4. Implement best practices such as strong cryptographic policies, regular audits and the principle of minimum authority. 5. Optimize performance, use sudo and adjust PAM module configuration. Through these methods, users can be effectively managed and system security can be improved.

Linux Operations: File System, Processes, and MoreMay 05, 2025 am 12:16 AM

The core operations of Linux file system and process management include file system management and process control. 1) File system operations include creating, deleting, copying and moving files or directories, using commands such as mkdir, rmdir, cp and mv. 2) Process management involves starting, monitoring and killing processes, using commands such as ./my_script.sh&, top and kill.

Linux Operations: Shell Scripting and AutomationMay 04, 2025 am 12:15 AM

Shell scripts are powerful tools for automated execution of commands in Linux systems. 1) The shell script executes commands line by line through the interpreter to process variable substitution and conditional judgment. 2) The basic usage includes backup operations, such as using the tar command to back up the directory. 3) Advanced usage involves the use of functions and case statements to manage services. 4) Debugging skills include using set-x to enable debugging mode and set-e to exit when the command fails. 5) Performance optimization is recommended to avoid subshells, use arrays and optimization loops.

Linux Operations: Understanding the Core FunctionalityMay 03, 2025 am 12:09 AM

Linux is a Unix-based multi-user, multi-tasking operating system that emphasizes simplicity, modularity and openness. Its core functions include: file system: organized in a tree structure, supports multiple file systems such as ext4, XFS, Btrfs, and use df-T to view file system types. Process management: View the process through the ps command, manage the process using PID, involving priority settings and signal processing. Network configuration: Flexible setting of IP addresses and managing network services, and use sudoipaddradd to configure IP. These features are applied in real-life operations through basic commands and advanced script automation, improving efficiency and reducing errors.

Linux: Entering and Exiting Maintenance ModeMay 02, 2025 am 12:01 AM

The methods to enter Linux maintenance mode include: 1. Edit the GRUB configuration file, add "single" or "1" parameters and update the GRUB configuration; 2. Edit the startup parameters in the GRUB menu, add "single" or "1". Exit maintenance mode only requires restarting the system. With these steps, you can quickly enter maintenance mode when needed and exit safely, ensuring system stability and security.

Understanding Linux: The Core Components DefinedMay 01, 2025 am 12:19 AM

The core components of Linux include kernel, shell, file system, process management and memory management. 1) Kernel management system resources, 2) shell provides user interaction interface, 3) file system supports multiple formats, 4) Process management is implemented through system calls such as fork, and 5) memory management uses virtual memory technology.

See all articles