dvbinfo: 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/dvbinfo - from package: dvbpsi-utils

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

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