regdbdump: 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/sbin/regdbdump - from package: crda

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

On Debian possible default full paths are:

/sbin/regdbdump - from package: crda

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

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