owlttb: 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/owlttb - from package: ion

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

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