freewrl: 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/freewrl - from package: freewrl

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

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