ttdelete: 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/ttdelete - from package: ctn

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

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