tv_to_latex: 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/tv_to_latex - from package: xmltv-util

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

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