vpddecode: 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/sbin/vpddecode - from package: dmidecode

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

On Debian possible default full paths are:

/usr/sbin/vpddecode - from package: dmidecode

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

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