How to detect filesystem type of un-mounted partition? These commands won't work:

fdisk -l      #outputs nothing...
su; fdisk -l  #nothing..
sudo fdisk -l #sudo not found...
parted -l     #parted not found...


Is there any app that shows that easly?

EDIT:

For now I had to attach the sdcard to PC and let Linux mount it, I found the partition was ext3 and not ext2 that I thought! All I read says partition must be mounted to know its type. I think we must create a path and mount it with automatic detection and see mount output to know the partition type.
Have you got the file command available? This question on SuperUser says that's the way to go.