system administration

The who command is an essential tool for displaying the users logged in to the Linux system. Whether you are using a personal computer or a server with multiple users, this command provides valuable information about active sessions. In most cases, as a single user on a personal computer, you will likely be the only one logged in. However, if you have opened multiple shells or terminal windows, each instance will be counted as a separate access, and who will display these details accordingly....

In the Linux operating system, the sudo command is commonly used to run a command as another user, most notably as the root user. This allows for the execution of privileged operations that require administrative permissions. To use sudo, you must have it enabled on your system. Once enabled, you can run commands as root by entering your user’s password (not the root user password). This provides an extra layer of security....