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The root directory is represented by ___

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The root directory is represented by ___

(a) \

(b) /

(c) *

(d) $

The question was posed to me during an interview for a job.

My question is based upon Categories of Files in portion The File System of Unix

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Right answer is (b) /

For explanation I would say: The root directory (/)  serves as a reference point for all the files. All the files are hierarchically below it. All files in UNIX are related to one another. The file system in UNIX is a collection of all these related files (ordinary, directory and device files) organized in a hierarchical manner.

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