rctest: 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/rctest - from package: bluez

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

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