rpdump: 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:

/usr/bin/rpdump - from package: alpine

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

On Debian possible default full paths are:

/usr/bin/rpdump - from package: alpine

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

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