A terminal interface is a text-based way to control software by typing commands and reading plain-text output. Instead of buttons or menus, the user interacts through prompts, flags, and command syntax. Terminal interfaces are common in administration tools, development environments, and security utilities because they are fast, scriptable, and easy to automate.
In cyber security, terminal interfaces matter because they often expose powerful functions directly to the user. That makes them useful for defenders running scans, inspecting logs, or managing systems, but it also means they must handle input carefully. If command parsing, quoting, or output handling is weak, attackers may abuse the interface for command injection, path manipulation, or unsafe automation. Security reviews therefore pay close attention to how a terminal-based tool validates text, separates data from commands, and limits what actions can be executed.