How to Upgrade CentOS 7 to CentOS 8 Linux

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.

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.

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.

cronisusedforpreciseschedulingonalways-onsystems,whileanacronensuresperiodictasksrunonsystemsthataren'tcontinuouslypowered,suchaslaptops;1.Usecronforexacttiming(e.g.,3AMdaily)viacrontab-ewithsyntaxMINHOURDOMMONDOWCOMMAND;2.Useanacronfordaily,weekly,o

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.

AfterinstallingLinux,thefirststepsincludeupdatingyoursystem,installingessentialsoftware,settingupbackupandsecuritymeasures,andcustomizingtheinterfacetosuityourpreferences.1)Updateyoursystemusingtheappropriatecommandforyourdistro(e.g.,sudoaptupdate&am

There are three main ways to install software on Linux: 1. Use a package manager, such as apt, dnf or pacman, and then execute the install command after updating the source, such as sudoaptininstallcurl; 2. For .deb or .rpm files, use dpkg or rpm commands to install, and repair dependencies when needed; 3. Use snap or flatpak to install applications across platforms, such as sudosnapinstall software name, which is suitable for users who are pursuing version updates. It is recommended to use the system's own package manager for better compatibility and performance.

ChoosePop!_OS,Ubuntu,NobaraLinux,orArchLinuxforoptimalgamingperformancewithminimaloverhead.2.InstallofficialNVIDIAproprietarydriversforNVIDIAGPUs,ensureup-to-dateMesaandkernelversionsforAMDandIntelGPUs.3.EnabletheperformanceCPUgovernor,usealow-latenc