CurrencyConverter: 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/CurrencyConverter - from package: gnustep-examples

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

On Debian possible default full paths are:

/usr/bin/CurrencyConverter - from package: gnustep-examples

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

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