glsl-lod-bias: 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/glsl-lod-bias - from package: piglit

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

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