ttb: 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/ttb - from package: ttb

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

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