CompTIA ITF+ Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The choice of UNIX and Linux as the operating systems that do not require file extensions to execute a program is based on how these systems handle executable files. In UNIX and Linux environments, a file is marked as executable through its permissions rather than its file extension. This means that any file can be executed as long as it has the correct permissions set, regardless of whether it has a specific file extension like ".sh" for shell scripts or ".bin" for binaries.

In contrast, operating systems such as Windows and MacOS depend on file extensions to determine how to treat a file. Windows uses file extensions to identify executable files and associates them with the appropriate application or command interpreter. Similarly, MacOS relies on a combination of file extension and metadata to identify executable files.

PalmOS also typically depends on certain files being specially marked or having a defined format to be executed, similar to how Windows and MacOS operate.

Understanding that UNIX and Linux manage file execution through permission settings rather than extensions clarifies why these systems fit the criteria outlined in the question.