core utilities

I‘m going to upgrade my FreeBSD 7.x server hard disks and going to send back the original 73GB hard disk to my vendor. I wanted to make sure that no one should able to use my personal data from old hard disk, especially files stored in /home/you/projects directory. I know how to use sDelete under MS-Windows to delete a file permanently. How do I permanently erase files under FreeBSD operating systems?

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How do I find out what package provides a file called /bin/ls? I use the rpm -qf /bin/ls command under Red Hat Enterprise Linux to find out package name. Can you tell me equivalent command for the same under Debian or Ubuntu Linux?

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