glite-proxy-renew: 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/glite-proxy-renew - from package: glite-px-proxyrenewal

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

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