in the post installation for LS210, i install mdadm, and get command not found

[vujnovich]

good day! I have the ls210 and the xfs was setup from the stock firmware... so i booted up and the post installation says

~# mdadm --detail --scan
ARRAY /dev/md0 metadata=0.90 UUID=8de323cf:21f920b7:2776d444:be501e4f
ARRAY /dev/md1 metadata=1.2 UUID=e82d03b7:a7afdb01:663e8e97:125fc7c9
ARRAY /dev/md20 metadata=1.2 UUID=116997d2:e7f48544:24542b4e:8e4c2e18

i try and run that and get" bash: mdadm: command not found"

i did install sudo like in the novaspirit tech. but not anything else. No idea how to access my files or mount it. im stuck on the very beginning right after i install mdadm

[1000001101000]

that mean mdadm isn't on the current user's path. Try one of the following first:
su - root
or
sudo su -