4Repositories and Package Management

• 4.1Package Management with apt

  Learn repository-based package management on Debian/Ubuntu: installing, updating, and removing with apt (apt-get, apt-cache, apt-file), finding which package contains a given file, and repository configuration in /etc/apt/sources.list.

• 4.2Debian Package Management

  Learn direct handling of deb packages without a repository: install/upgrade/remove with dpkg, listing installed packages (-l), listing a package's files (-L), reverse lookup (-S), and re-configuration with dpkg-reconfigure.

• 4.3Package Management with yum

  Learn repository-based package management on RHEL-family systems: install/update/remove/search with yum, finding the package that provides a file (provides), repository configuration (/etc/yum.repos.d/, /etc/yum.conf), and download-only fetching with yumdownloader.

• 4.4RPM Package Management

  Learn direct handling and querying of rpm packages without a repository: obtaining version/status/dependency/integrity/signature information with rpm (-q family), listing a package's files (-ql), and reverse lookup of a file's owner (-qf).