pciconf: 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/pciconf - from package: php-pear-PHP-CompatInfo

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

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