gfal-save: 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-save - from package: gfal2-util

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

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