gfal_version-32: 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/gfal_version-32 - from package: gfal

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

Error in other languages:
gfal_version-32: bevel nie gevind nie
gfal_version-32: comandă negăsită
gfal_version-32: comando não encontrado
gfal_version-32: commande introuvable
gfal_version-32: command not found
gfal_version-32: käsku ei ole
gfal_version-32: không tìm thấy lệnh
gfal_version-32: komanda nerasta
gfal_version-32: Kommando nicht gefunden.
gfal_version-32: kommandot finns inte
gfal_version-32: komut yok
gfal_version-32: nie znaleziono polecenia
gfal_version-32: níor aimsíodh an t-ordú
gfal_version-32: no se encontró la orden
gfal_version-32: no s'ha trobat l'ordre
gfal_version-32: opdracht niet gevonden
gfal_version-32: parancs nem található
gfal_version-32: perintah tidak ditemukan
gfal_version-32: príkaz nenájdený
gfal_version-32: příkaz nenalezen
gfal_version-32: команда не найдена
gfal_version-32: командата не е открита
gfal_version-32: 命令找不到
gfal_version-32: コマンドが見つかりません