BZip2 Translator Tool is developed by Venkataraman, Ankur and Shikka.
Using this translator, when mapped on a file, you can do bzip
compressed I/O (Like Read, Seek, Length).
URL: http://www.gnu-india.org/pipermail/gnu-india/20010307/000113.html

One Day One Command
===================

umount — UnMount File System

Summary:

The umount command detaches the file system(s) mentioned from the file
hierarchy. A file system cannot be unmounted when it is `busy’, For
example, when there are open files on it, or when some process has its
working directory there, or when a swap file on it is in use.

Examples:

# umount /mnt/cdrom — Unmount the CDROM, using mount point.

# umount -v /dev/cdrom — Unmount the CDROM, using device file and

? ? ? ? ? ? ? ? ? ? ? ? ?show verbose messages.

# umount -f /nfs/home — Force unmount (Useful in case of an

? ? ? ? ? ? ? ? ? ? ? ? unreachable NFS system).

# umount -l /media/floppy — Lazy unmount (I don’t care, why the

? ? ? ? ? ? ? ? ? ? ? ? ? ? device is busy).

# umount -n /mnt/cdrom — Unmount, with-out updating the /etc/mtab,

? ? ? ? ? ? ? ? ?which contains the list of currently mounted FSs.

Read: man umount