tv_grab_it_dvb: 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_grab_it_dvb - from package: xmltv-util

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

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