supscan: 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/supscan - from package: sup

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

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