xbmc: 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/xbmc - from package: xbmc

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

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