vdpauinfo: 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 CentOS possible default full paths are:

/usr/bin/vdpauinfo - from package: vdpauinfo

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/vdpauinfo - from package: vdpauinfo

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

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