freewrl_snd: 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_snd - from package: freewrl

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

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