fedora-cert: 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/fedora-cert - from package: fedora-cert

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

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