osgpdf: 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/osgpdf - from package: openscenegraph

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

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