RHEL Linux - Red Hat System Administration Practice Exam

What command is used to update the system packages in RHEL?

1. yum update

2. dnf upgrade

3. pkg upgrade

4. apt-get install

The correct answer is: yum update

The command used to update the system packages in RHEL is closely associated with the package management system utilized by the distribution. In Red Hat Enterprise Linux (RHEL), the package management tool predominantly used is either `yum` or `dnf`, depending on the version of RHEL being used. When using RHEL 7 and earlier, `yum` is the command for managing packages. Specifically, `yum update` is utilized to download and install the latest versions of all packages currently installed on the system, effectively keeping the system packages up to date. This command not only updates the system software but can also include dependencies as required. In RHEL 8 and later, `dnf` replaces `yum` as the default package manager. Here, the command `dnf upgrade` serves a similar purpose, updating the system and ensuring that all installed packages receive the most recent updates. The other choices listed are not applicable to RHEL. `pkg upgrade` is a command used in systems like FreeBSD for package management. `apt-get install` pertains to Debian-based distributions like Ubuntu and is not used in RHEL's package management ecosystem. Therefore, `yum update` is indeed the correct answer for updating system packages in RHEL for those