func-yum: 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-yum - from package: func

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

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