osgmemorytest: 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/osgmemorytest - from package: openscenegraph

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

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