lcg-ra: command not found

Have You tried accessing the binary with the full path?

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/lcg-ra - from package: lcg-util

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