flowscan: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/flowscan - from package: flowscan

You may install the required package with command apt-get install {package}

Error in other languages:
flowscan: bevel nie gevind nie
flowscan: comandă negăsită
flowscan: comando não encontrado
flowscan: commande introuvable
flowscan: command not found
flowscan: käsku ei ole
flowscan: không tìm thấy lệnh
flowscan: komanda nerasta
flowscan: Kommando nicht gefunden.
flowscan: kommandot finns inte
flowscan: komut yok
flowscan: nie znaleziono polecenia
flowscan: níor aimsíodh an t-ordú
flowscan: no se encontró la orden
flowscan: no s'ha trobat l'ordre
flowscan: opdracht niet gevonden
flowscan: parancs nem található
flowscan: perintah tidak ditemukan
flowscan: príkaz nenájdený
flowscan: příkaz nenalezen
flowscan: команда не найдена
flowscan: командата не е открита
flowscan: 命令找不到
flowscan: コマンドが見つかりません