olad: 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/olad - from package: ola

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

On Debian possible default full paths are:

/usr/bin/olad - from package: ola

You may install the required package with command apt-get install {package}

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