rdd-verify: 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/rdd-verify - from package: rdd

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

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