osgshaderterrain: 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/osgshaderterrain - from package: openscenegraph

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

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