title: How can I to create a shared directory from Redhat virtualbox vm to a Ubuntu 12.04 guest os?
body: <p>I have a 64bit Redhat VirtualBox (4.3.30) guest running and want to create an shared directory to my host OS (Ubuntu 12.04 64bit).
  In my Redhat guest OS:</p>
  
  <ol>
  <li>I installed VirtualBoxGuest Additions for Virtualbox 4.3.30 and
  rebooted the guest</li>
  <li>I created the directory <strong>/mnt/host-downloads</strong> on my guest OS</li>
  <li>In Virtual box I created a shared directory named Downloads with points to host directory <strong>/home/cx/Downloads</strong></li>
  </ol>
  
  <p>When I try to mount de shared directory with the command:
  <strong>sudo mount –t vboxsf Downloads /mnt/host-downloads</strong></p>
  
  <p>I get the message:</p>
  
  <p>"Usage: mount -V                 : print version
         mount -h                 : print this help
         mount                    : list mounted filesystems
         mount -l                 : idem, including volume labels
  So far the informational part. Next the mounting.
  The command is `mount [-t fstype] something somewhere'.
  Details found in /etc/fstab may be omitted.
         mount -a [-t|-O] ...     : mount all stuff from /etc/fstab
         mount device             : mount device at the known place
         mount directory          : mount known device here
         mount -t type dev dir    : ordinary mount command
  Note that one does not really mount a device, one mounts
  a filesystem (of the given type) found on the device.
  One can also mount an already visible directory tree elsewhere:
         mount --bind olddir newdir
  or move a subtree:
         mount --move olddir newdir
  One can change the type of mount containing the directory dir:
         mount --make-shared dir
         mount --make-slave dir
         mount --make-private dir
         mount --make-unbindable dir
  One can change the type of all the mounts in a mount subtree
  containing the directory dir:
         mount --make-rshared dir
         mount --make-rslave dir
         mount --make-rprivate dir
         mount --make-runbindable dir
  A device can be given by name, say /dev/hda1 or /dev/cdrom,
  or by label, using  -L label  or by uuid, using  -U uuid .
  Other options: [-nfFrsvw] [-o options] [-p passwdfd].
  For many more details, say  man 8 mount ."</p>
  
  <p><strong>What do I wrong?</strong></p>