how to edit the hosts file in linux

Linuxcanrunonmodesthardwarewithspecificminimumrequirements.A1GHzprocessor(x86orx86_64)isneeded,withadual-coreCPUrecommended.RAMshouldbeatleast512MBforcommand-lineuseor2GBfordesktopenvironments.Diskspacerequiresaminimumof5–10GB,though25GBisbetterforad

Confirm the target hard disk device name (such as /dev/sda) to avoid accidentally deleting the system disk; 2. Use sudoddif=/dev/zeroof=/dev/sdXbs=1Mstatus=progress to overwrite the zero value in full disk, which is suitable for most scenarios; 3. Use sudoshred-v-n3/dev/sdX for three random data overwrites to ensure that it cannot be restored; 4. Optionally execute sudobadblocks-wsv/dev/sdX for destructive write tests; finally use sudohexdump-C/dev/sdX|head to verify whether it is all zero and complete safe erasing.

Add useradd or adduser commands commonly used by users in Linux. 1. When using useradd, you need to manually set the password and home directory. Add the -m parameter to create the home directory; 2. You can specify the shell, group and UID through parameters such as -s, -G, and -u; 3. Adduser is an interactive command, suitable for novices to automatically complete the configuration; 4. Pay attention to permissions, username uniqueness and home directory permissions; 5. Userdel can be used to delete users and home directory by mistake. Mastering these key points allows you to manage users efficiently and securely.

There are four ways to obtain command help in Linux: First, use --help to view basic usage, which is suitable for quickly understanding common options and parameters of commands; second, use man to view the complete man page, providing detailed command descriptions and examples; third, use info to view structured help, which is suitable for information navigation of complex commands such as gcc and make; fourth, refer to network resources and communities, such as Linux China, StackOverflow and other platforms to obtain Chinese materials or solve specific problems. It is recommended for beginners to master it step by step from --help and man.

If you want to know the Linux system information and version, you can use the following steps: 1. Use lsb_release-a to view the distribution information; 2. View the /etc/os-release file to obtain version details; 3. Use uname-r or uname-mrs to confirm the kernel version and system architecture; 4. Run lscpu, free-h or dmidecode (requires root permissions) to obtain hardware information. The above method is applicable to different distributions, and some commands may require installation or permission adjustment.

The Linux Foundation has unveiled a new pre-professional IT certification known as the Linux Foundation Certified IT Associate (LFCA). This is a new entry-level certification that focuses on testing fundamental IT concepts such as basic systems admin

Have you ever found yourself needing to process CSV files and generate output in a structured table format? Not too long ago, I was dealing with a messy file that wasn't properly formatted. It had excessive spaces between each column, and I needed to

To modify the hosts file of the Linux system, you need to edit it with administrator permissions. 1. The hosts file is located in the /etc/ directory, and cat/etc/hosts can be viewed; 2. Use sudo to modify it with editors such as nano/vim/gedit, and the format is the IP address and the host name; 3. After modification, it may need to clear the DNS cache or restart the NetworkManager service to take effect; 4. Pay attention to the correct format, avoid frequent modifications, and comment on uncertain entries to operate safely.