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This article provides a comprehensive guide on using the `rpm -qa` command to list installed RPM packages on RPM-based Linux systems including RHEL, CentOS, and Fedora. Aimed at Linux administrators and power users, it details basic command usage, sorting, and filtering options, while also covering other package managers like `apt`, `dnf`, and `zypper` for similar tasks across different Linux distributions. Additionally, the article offers tips for effective package management, emphasizing regular updates and detailed package reviews.