pddet: 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/pddet - from package: crashme

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

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