ASR scan from terminal not working

I am trying to run the "-imagescan" call in the terminal and it's not working. Can anybody tell me what I am doing wrong? here it is the way I typed it: [Admin:/Volumes/Test Partition] root# /usr/bin/asr -imagescan ./Volumes/Test\ Partition/HD.ro_asr.dmg /usr/bin/asr: Command not found.