bdj_test: 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/bdj_test - from package: libbluray

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

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