osgvertexprogram: 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/osgvertexprogram - from package: openscenegraph

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

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