osgshaders: 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/osgshaders - from package: openscenegraph

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

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