bacula-dir.mysql: 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/bacula-dir.mysql - from package: bacula-director-mysql

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

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