osglight: 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 Debian possible default full paths are:

/usr/bin/osglight - from package: openscenegraph

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

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