glewinfo: 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/glewinfo - from package: glew

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

On Debian possible default full paths are:

/usr/bin/glewinfo - from package: glew-utils

You may install the required package with command apt-get install {package}

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