


Use the yum command to install the ifconfig tool. The ifconfig tool is included in the "net-tools" tool package. You only need to open a terminal and execute the "yum install net-tools package name" command to install the "net-tools" tool package, and you can use the ifconfig command.
#The operating environment of this tutorial: CentOS 6 system, Dell G3 computer.
The ifconfig command is a program that sets or displays the network interface. It can display the network card information of our machine. However, sometimes when minimally installing Linux distributions such as CentOS, ifconfig and other commands will not be installed by default. At this time, you Enter the terminal and run the ifconfig command and an error will occur.
The first thing I think about is whether there is no path to the ifconfig command in the environment variable, because ifconfig is under the /sbin path, as the root user It can be run only after logging in. Look at the environment variables of the root user.
The environment variable contains the path /sbin. That is to say, if the ifconfig command exists and is located in the /sbin directory If it is, it can definitely be run, then check if there is an ifconfig command in the /sbin directory
The result shows that there is no ifconfig command in the /sbin directory, so: ifconfig is not installed in CentOS
Solution: Use yum to install ifconfig
Through the yum search
command, we found that the ifconfig command is in the net-tools
tool package. Next, we only need to install this package.
Check if the installation is successful
Run successfully!
At this time, are you as confused as I was at the beginning? Why is the ipconfig command in Windows not required to be installed in Linux? It turns out that the ifconfig command comes from net-tools. This package includes ifconfig and netstat. , whois and other commands, so you could not run these commands before
Related recommendations: "Linux Video Tutorial"
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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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The core components of Linux include the kernel, file system, shell and common tools. 1. The kernel manages hardware resources and provides basic services. 2. The file system organizes and stores data. 3. Shell is the interface for users to interact with the system. 4. Common tools help complete daily tasks.

The basic structure of Linux includes the kernel, file system, and shell. 1) Kernel management hardware resources and use uname-r to view the version. 2) The EXT4 file system supports large files and logs and is created using mkfs.ext4. 3) Shell provides command line interaction such as Bash, and lists files using ls-l.

The key steps in Linux system management and maintenance include: 1) Master the basic knowledge, such as file system structure and user management; 2) Carry out system monitoring and resource management, use top, htop and other tools; 3) Use system logs to troubleshoot, use journalctl and other tools; 4) Write automated scripts and task scheduling, use cron tools; 5) implement security management and protection, configure firewalls through iptables; 6) Carry out performance optimization and best practices, adjust kernel parameters and develop good habits.


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