diodls: 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/diodls - from package: diod

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

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