UNIX Statement Analysis

This section evaluates the given statements about the UNIX operating system to identify the incorrect one.

Evaluating UNIX Features

• Statement 1: It is written in C. This is correct. UNIX's design heavily utilized the C programming language, contributing significantly to its portability.
• Statement 2: It is portable to a variety of computers. This is correct. Because UNIX was primarily written in C, it could be adapted (ported) to different hardware architectures more easily than systems written in assembly language.
• Statement 3: It is a multi-user operating system. This is correct. UNIX was designed from early on to support multiple users logged in and running processes simultaneously.
• Statement 4: It cannot be time-shared by several users. This is incorrect. UNIX is a prime example of a time-sharing operating system. Time-sharing allows multiple users to access and use the computer system concurrently by allocating small time slices to each user's process.

Conclusion on Incorrect Statement

The statement that UNIX cannot be time-shared by several users is false. UNIX is fundamentally a multi-user, time-sharing system.