pcimodules: 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/pcimodules - from package: pciutils

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

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