tv_grab_it: command not found

Have You tried accessing the binary with the full path?

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_grab_it - from package: xmltv-util

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