tv_cat: 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_cat - from package: xmltv-util

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