tdfd: 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/tdfd - from package: tcm

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

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