osgshadow: 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/osgshadow - from package: openscenegraph

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

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