initialized-vbo: 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/lib64/piglit/bin/initialized-vbo - from package: piglit

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

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