dpnsdaemon: 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/dpnsdaemon - from package: dpm-name-server-mysql

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

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