1. (2 Marks) Explain how 642 octal corresponds to “rw-r—w-” permissions (minimum 3 sentences).
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2. (2 Marks) What does the ‘passthrough permissions’ mean for directories. Give two octal numbers that are acceptable passthrough settings.
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3. (2 Marks) Explain why octal value 777 is not an acceptable setting for directories except when used for /tmp
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4. (2 Marks) Where are binary, octal, and hexadecimal numbers commonly used? For example: octal values are used to change file permissions. Similarly, give one example field within computers where binary and hexadecimal values are commonly used. Minimum two sentences, one example for binary and another for hexadecimal.
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5. (2 Marks) Explain chmod with symbolic options for changing permissions. When would you use symbolic values instead of octal values?
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