rdump: 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 CentOS possible default full paths are:

/sbin/rdump - from package: dump

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/rdump - from package: dump

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

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