glinfo: 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/glinfo - from package: piglit

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

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