EquityOption: 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 Debian possible default full paths are:

/usr/bin/EquityOption - from package: quantlib-examples

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

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