func-inventory: 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/func-inventory - from package: func

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

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