ntdbdump: 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/ntdbdump - from package: samba4-client

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

On Debian possible default full paths are:

/usr/bin/ntdbdump - from package: ntdb-tools

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

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