John works as a Network Administrator for Perfect Solutions Inc. The company has a Linux- based network. He is working as a root user on the Linux operating system. He wants to delete his…

'rmdir' is used to remove empty directories, not files, and it performs no secure overwriting of data before deletion.

'shred -vfu private.txt' is missing the '-z' flag, so the file would be securely overwritten and removed but the shredding would not be hidden with a final zero-pass as required.

The 'shred -vfuz private.txt' command uses four flags together: '-v' for verbose output, '-f' to force overwriting by changing file permissions if needed, '-u' to remove (unlink) the file after overwriting, and '-z' to add a final zero-byte overwrite pass that hides the fact that shredding was performed. This combination satisfies all requirements: secure deletion, file removal, and concealment of the shredding process.

'rm -vf private.txt' simply removes the file from the directory index without overwriting its data, making recovery straightforward with standard forensic tools.