cert-init.pl: 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/cert-init.pl - from package: perl-VOMS-Lite

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