osgsidebyside: 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/osgsidebyside - from package: openscenegraph

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

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