rt2: 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/rt2 - from package: rttool

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

Error in other languages:
rt2: bevel nie gevind nie
rt2: comandă negăsită
rt2: comando não encontrado
rt2: commande introuvable
rt2: command not found
rt2: käsku ei ole
rt2: không tìm thấy lệnh
rt2: komanda nerasta
rt2: Kommando nicht gefunden.
rt2: kommandot finns inte
rt2: komut yok
rt2: nie znaleziono polecenia
rt2: níor aimsíodh an t-ordú
rt2: no se encontró la orden
rt2: no s'ha trobat l'ordre
rt2: opdracht niet gevonden
rt2: parancs nem található
rt2: perintah tidak ditemukan
rt2: príkaz nenájdený
rt2: příkaz nenalezen
rt2: команда не найдена
rt2: командата не е открита
rt2: 命令找不到
rt2: コマンドが見つかりません