A systems administrator is creating a backup copy of the /home/directory. Which of the following commands allows the administrator to archive and compress the directory at the same time?

A systems administrator is preparing a Linux system for application setup. The administrator needs to create an environment variable with a persistent value in one of the user accounts.
Which of the following commands should the administrator use for this task?

Which of the following utilities can securely delete a Linux directory from a filesystem and ensure it cannot be recovered?

A systems administrator is patching servers that are vulnerable to the regreSSHion bug. Which of the following commands allows the administrator to patch the servers?

Users report that after about a week, an application hosted in a system stops responding, requiring the system to be restarted to recover. A systems administrator connects to the system and obtains the following output:

Which of the following describes the reason the application stops responding?