To answer this question, you need to understand the command used to find the block size on a Unix file system.

Option A) blksz - This option is incorrect because there is no such command "blksz" to find the block size on a Unix file system.

Option B) szblk - This option is incorrect because there is no such command "szblk" to find the block size on a Unix file system.

Option C) cmchk - This option is correct because the "cmchk" command is used to find the block size on a Unix file system. This command can be used to check the block size of a file system or a device.

Option D) chksz - This option is incorrect because there is no such command "chksz" to find the block size on a Unix file system.

The correct answer is Option C) cmchk. This option is correct because the "cmchk" command is used to find the block size on a Unix file system.

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• Wrong explanation

To answer this question, we need to understand the concept of directory files and their links.

In a file system, a directory file is used to store information about other files and directories. Each directory file contains a list of links, which are references to other files or directories.

The minimum number of links for any directory file is actually 2. The first link is a reference to itself (".") and the second link is a reference to its parent directory (".."). These links are necessary for the directory file to maintain its own location and hierarchy within the file system.

Therefore, the correct answer is:

B) False - The minimum number of links for any directory file is 2, not 0.

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• Wrong explanation

To answer this question, you need to understand the purpose of the different UNIX commands related to writing data to disk.

Option A) write - This option is incorrect because the "write" command is used to send messages to other users or terminals, not to write data to the disk.

Option B) sync - This option is correct because the "sync" command is used to flush file system buffers and write in-core super block and inode table information to the disk. It ensures that all pending disk writes are completed and that the file system is synchronized.

Option C) insync - This option is incorrect because there is no "insync" command in UNIX. It is not a valid command.

Option D) write_core - This option is incorrect because there is no "write_core" command in UNIX. It is not a valid command.

The correct answer is B) sync. This option is correct because the "sync" command is used to write in-core super block and inode table information to the disk, ensuring that all pending disk writes are completed and that the file system is synchronized.

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• Wrong explanation