opticalraytracer: 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/opticalraytracer - from package: opticalraytracer

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

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