A UNIX shell script program file is

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BlackTom AI · Accepted Answer

Consider the question: what is a UNIX shell script program file?
Option A: 'a text file.' A shell script is indeed stored as a plain text file containing commands, so this part is true in a sense. However, just being a text file doesn’t capture all essential characteristics of a shell script, such as its executable nature and the fact that it contains a sequence of shell commands.
Option B: 'All of these.' This option asserts that a shell script can be described by multiple overlapping attributes, which aligns with the reality that a shell script is a file containing commands, is a program that runs in the shell, and is typically a text file. If each of the other statements can be considered accurate in some respect, this all-encompassing option becomes plausible.
Option C: 'a file containing Unix commands' This is accurate because a shell script consists of a list of commands that are interpreted by the shell. The content is indeed commands that the shell executes.
Option D: 'a program which can run on shell.' A shell script is designed to be executed by the shell, effectively behaving as a small program or script that the shell runs.

Analyzing these options together, notice that A describes a valid property (text file), C describes the core content (Unix commands), and D describes the functional nature (a runnable program via the shell). When taken collectively, they describe the same object from complementary angles. This means that each of A, C, and D captures a true aspect of what a UNIX shell script is, while B asserts that all true aspects are captured in one statement. Since A, C, and D are all correct components and B claims all of them simultaneously, B is also consistent with the union of these truths.

If a student tests the boundaries: a text file (A) is necessary, but incomplete on its own; a file containing Unix commands (C) is precise about content but not about executability; a program which can run on shell (D) emphasizes execution, which is indeed essential; and All of these (B) correctly aggregates these valid characterizations. The combination of properties across A, C, and D supports B as the most comprehensive description.

In summary, each statement (A, C, D) describes a true facet of a shell script, and B appropriately encompasses all true facets into one option, reflecting the full nature of a UNIX shell script program file.

A UNIX shell script program file is

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