lttv.real: 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/lttv.real - from package: lttv

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

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