rtdClient: 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/rtdClient - from package: skycat

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

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