multirender_test: 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/multirender_test - from package: LibRaw-samples

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

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