Question at position 18 Which of the following statements about Unix is NOT true?When a file is created with Unix, its permission values are set automatically.Unix is a multi-user system.In Unix, any user cannot access to other user's account if the password is unknown.A shell scripts program can usually only run on one type of shell in Unix.

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Question at position 18 asks which statement about Unix is NOT true. 
Option 1: 'When a file is created with Unix, its permission values are set automatically.' In Unix-like systems, the permissions on a newly created file are determined by the process umask at the time of creation, effectively setting default permissions automatically. This statement aligns with how Unix handles default permissions, so it is true.
Option 2: 'Unix is a multi-user system.' Unix architectures are designed as multi-user operating systems, where many users can log in and share system resources. This is a core characteristic, so this statement is true.
Option 3: 'In Unix, any user cannot access to other user's account if the password is unknown.' Generally, access to another user’s account requires proper authentication; without the correct password (or root privileges), a standard user cannot log into another user’s account. This is true for typical Unix security models, though administrators with elevated privileges may override. Overall, the statement is true in standard usage.
Option 4: 'A shell scripts program can usually only run on one type of shell in Unix.' This claim asserts that a shell script is tied to a single shell and cannot run under others. In reality, the behavior of a script depends on its shebang line (for example, #!/bin/sh or #!/bin/bash) and on the constructs used within the script. While many scripts are written to rely on a specific shell and may fail if run with a different shell, others are designed to be portable or to specify an interpreter explicitly. Because it is common for scripts to fail or behave differently when executed with an incompatible shell, and because the claim uses the absolute word 'usually only run on one type of shell,' this statement is the one that is not universally true. Therefore, this option is the NOT true statement.
In summary, the reasoning shows that options 1, 2, and 3 describe typical, accurate aspects of Unix behavior, while option 4 makes a more absolutist claim that is not universally accurate across all scripts and scenarios, making it the incorrect choice.

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