osguserstats: 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/osguserstats - from package: openscenegraph

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

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