Which of the following commands determines the type of a file by using a definition database file which contains information about all common file types?
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A. B. C. D. E.C
The command that determines the type of a file by using a definition database file which contains information about all common file types is the "file" command. Therefore, the correct answer is C. file.
The "file" command is a standard Linux command that is used to identify the file type of a file or files. It determines the file type by examining the contents of the file, rather than relying on the file extension or other metadata.
The "file" command uses a magic number database to determine the file type. The magic number database is a file that contains a list of patterns that identify the contents of files. These patterns are known as magic numbers, and they are used to identify the type of file based on its content. The "file" command reads this database to determine the file type.
The "magic" command (A) is actually the underlying library used by the "file" command to determine file types. The "type" command (B) is used to display the type of a command or file. The "pmagic" command (D) is not a standard Linux command, and the "hash" command (E) is used to compute a hash value for a file. Therefore, options A, B, D, and E are not correct answers for the given question.