dund: 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/dund - from package: bluez-compat

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

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