pci-config: 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/sbin/pci-config - from package: nictools-pci

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