The “Package” in Linux is also known as the “Application Software”. Users can install these packages from official and unofficial (using repositories) sources. While installing a package, users find it necessary to check if the application software is already...
nslookup asks a DNS server what a name resolves to. It is the quickest way to check whether a domain points where you expect, which mail servers handle a domain, or whether your Debian machine can resolve names at all. If you are troubleshooting connectivity, pair it...
Quick answer: netstat is not installed by default on Debian 13 (Trixie) or Debian 12 (Bookworm). It comes from the legacy net-tools package, so run sudo apt install net-tools. For listening ports you do not need to install anything on most systems: ss -tulpn (from...
dig (Domain Information Groper) sends a DNS query and shows you the full answer: which server replied, how long the record will be cached, and every section of the response. It is the standard tool for checking DNS changes, debugging mail records and confirming a...
The Linux Kernel is the core of the Operating system. It is a special program that handles system calls, manages the memory or devices, permission control and system’s security. In short, the Kernel manages everything. Quick answer: On Debian 13 (Trixie) and...
