examiner: 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/examiner - from package: examiner

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

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