func-ps-compare: 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-ps-compare - from package: func

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

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