The purpose of code "#! /bin/sh" at the beginning of a Unix script is

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The question asks about the purpose of the line "#! /bin/sh" at the start of a Unix script. 
Option 1: "To tell the system that the script will be running on BASH shell." This is not accurate because /bin/sh designates the system’s default shell, which may be dash, bash, or another shell, but it does not guarantee BASH specifically. The directive uses the interpreter path, not a specific shell name like BASH. 
Option 2: "To tell the system that the script will be running on Unix Bin shell." The phrasing is misleading: there is a standard interpreter at /bin/sh on Unix-like systems, but the phrase "Unix Bin shell" is not a precise or common way to describe the purpose. The key idea is selecting the interpreter, not invoking a generic "Unix Bin shell" concept. 
Option 3: "it is a comments line, as it starts with an \"#\"." Although lines starting with # are comments in many scripting languages, the shebang line is not a comment; it has a special meaning to the kernel. The presence of "#!" indicates an interpreter directive and is executed by the program loader, not treated as a comment. 
Option 4: "To tell the system that it is a Unix shell script." This captures the essential purpose: the shebang sequence (#!) followed by the path to an interpreter, here /bin/sh, tells the operating system which interpreter should execute the script, thereby identifying it as a shell script intended to be run with that shell. 
In summary, the critical idea is that the shebang line specifies the interpreter, enabling the script to be executed directly and indicating it is a shell/script that should be run by /bin/sh, rather than merely being a comment or implying a specific shell like BASH. 
The remaining options either misstate the exact interpreter, rely on unclear terminology, or treat the line as a simple comment, which does not reflect the actual mechanism of script execution. Therefore, the nuanced understanding is that the shebang targets the interpreter and signals a Unix shell script, aligning with option 4.

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The purpose of code "#! /bin/sh" at the beginning of a Unix script is

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