func: 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 CentOS possible default full paths are:

/usr/bin/func - from package: func

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