arc-infoindex-relay: 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/sbin/arc-infoindex-relay - from package: nordugrid-arc-egiis

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

On Debian possible default full paths are:

/usr/sbin/arc-infoindex-relay - from package: nordugrid-arc-egiis
/usr/lib/debug/usr/sbin/arc-infoindex-relay - from package: nordugrid-arc-dbg

You may install the required package with command apt-get install {package}

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