Which command is used to update packages in a Debian-based Linux system?

The command used to update packages in a Debian-based Linux system is indeed apt-get upgrade. This command specifically upgrades the installed packages to their latest versions based on the package information available.

When using the package management tool in a Debian system, users typically execute the apt-get update command first to refresh the local package index with information from the configured repositories. This process ensures that the system is aware of the latest updates available. However, it is the apt-get upgrade command that actually performs the update by upgrading the installed packages to their recent versions.

In summary, while apt-get update is essential for updating the package list, it is apt-get upgrade that applies the updates to the installed software. This distinction is crucial for effective package management on Debian-based systems.