gfal_testcreatdir: 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_testcreatdir - from package: gfal-doc

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

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