diodload: 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/sbin/diodload - from package: diod

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

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