To delete a user on a Linux system, you can use the userdel command. Here’s the basic syntax for using the userdel command: userdel <username> For example, if you want to delete the user john, you would run the following command: sudo userdel john Note that by default, the userdel command only removes the user … Read more
htop is a popular process monitoring tool for Linux that provides a more user-friendly and interactive way of monitoring system processes than the standard top utility. Here’s how you can install htop on CentOS or RHEL: Update the package index: Before installing any new packages, you should always update the package index on your system. … Read more
The “Neighbour Table Overflow” error in Linux can occur when the system’s neighbor cache table, which is used to store information about network neighbors such as ARP cache entries, has become full. This can result in network connectivity issues and may cause other problems, such as high network latency or dropped packets. Here are a … Read more
To find out what partition a file belongs to on Linux, you can use the df command with the -P option, which displays the file system space usage, including the file system type, total size, used space, available space, and the mounted file system. Here’s the basic syntax for using the df command: df -P … Read more
The PHP Fatal error: Cannot redeclare wfProfileIn() error in MediaWiki typically occurs when there is a conflict between multiple copies of the same function or class in your MediaWiki installation. This error can be caused by a number of different issues, such as: Multiple copies of the same extension installed in different directories A corrupted … Read more
To blacklist packages using the yum package manager on Red Hat Enterprise Linux (RHEL) or CentOS, you can create a file in the /etc/yum.repos.d/ directory that excludes the packages you want to blacklist. The file should have the extension .repo, and the content should specify the packages you want to exclude, using the exclude option. … Read more
In CentOS and Red Hat Enterprise Linux (RHEL), you can change or copy the SELinux security context of a file using the chcon or semanage command. The chcon command is used to change the SELinux security context of a file, and it has the following syntax: chcon <context> <file> For example, to change the SELinux … Read more
To reinstall a package using the yum package manager on CentOS or Red Hat Enterprise Linux (RHEL), you can use the yum reinstall command, followed by the name of the package you want to reinstall: sudo yum reinstall <package_name> For example, if you want to reinstall the httpd package: sudo yum reinstall httpd This command … Read more
In OpenSSH, host key checking is a security feature that is enabled by default. It prevents man-in-the-middle attacks by verifying that the server you are connecting to is the one you intended to connect to, by checking its host key against the list of known host keys stored in your local machine. However, in some … Read more
In Linux or Unix, you can list the contents of a directory and its subdirectories recursively using the ls command with the -R or –recursive option. Here’s an example: ls -R /path/to/directory This will list the contents of the directory /path/to/directory and all its subdirectories, displaying the names of files and directories in a tree-like … Read more