gnome-rdp: 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/gnome-rdp - from package: gnome-rdp

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

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