bitbyte@usbc01:/$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/bin/X11:/usr/games
bitbyte@usbc01:/$ which mkfs.ntfs
bitbyte@usbc01:/$ mkfs.ntfs --help
The program 'mkfs.ntfs' is currently not installed. You can install it by typing:
sudo apt-get install ntfs-3g
bitbyte@usbc01:/$ sudo apt-get instsall ntfs-3g
E: Invalid operation instsall
bitbyte@usbc01:/$ sudo apt-get install ntfs-3g
Reading package lists... Done
Building dependency tree
Reading state information... Done
ntfs-3g is already the newest version.
The following packages were automatically installed and are no longer required:
  linux-headers-3.8.0-19 linux-headers-3.8.0-19-generic linux-headers-3.8.0-23 linux-headers-3.8.0-23-generic
  linux-image-3.8.0-19-generic linux-image-3.8.0-23-generic linux-image-extra-3.8.0-19-generic
  linux-image-extra-3.8.0-23-generic
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
bitbyte@usbc01:/$ sudo which mkfs.ntfs
bitbyte@usbc01:/$ export PATH=/bin:/sbin:/usr/bin:/usr/sbin
bitbyte@usbc01:/$ sudo which mkfs.ntfs
bitbyte@usbc01:/$ which mkfs.ntfs
bitbyte@usbc01:/$