transponder: 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/sbin/transponder - from package: fair

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

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