dc3dd: 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/dc3dd - from package: dc3dd

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

Error in other languages:
dc3dd: bevel nie gevind nie
dc3dd: comandă negăsită
dc3dd: comando não encontrado
dc3dd: commande introuvable
dc3dd: command not found
dc3dd: käsku ei ole
dc3dd: không tìm thấy lệnh
dc3dd: komanda nerasta
dc3dd: Kommando nicht gefunden.
dc3dd: kommandot finns inte
dc3dd: komut yok
dc3dd: nie znaleziono polecenia
dc3dd: níor aimsíodh an t-ordú
dc3dd: no se encontró la orden
dc3dd: no s'ha trobat l'ordre
dc3dd: opdracht niet gevonden
dc3dd: parancs nem található
dc3dd: perintah tidak ditemukan
dc3dd: príkaz nenájdený
dc3dd: příkaz nenalezen
dc3dd: команда не найдена
dc3dd: командата не е открита
dc3dd: 命令找不到
dc3dd: コマンドが見つかりません