Which command is used to install all packages in a specified yum group?

The command used to install all packages in a specified yum group is yum groupinstall. This command allows users to install an entire group of related packages in one go, which can be particularly useful for setting up a specific environment or application stack without having to specify each package individually.

When using yum groupinstall, you simply need to specify the name of the group you wish to install, and yum will handle the process of installing all packages associated with that group. This streamlines the installation process and ensures that all necessary dependencies for the group are also satisfied.

The other choices listed do not accurately reflect the correct command syntax or functionality. yum installgroup is not a valid command, as the correct terminology is "groupinstall." Similarly, yum installall and yum taskinstall are not standard commands associated with the yum package manager. The correct terminology and syntax are essential in package management to avoid errors and ensure proper installations.