fedpkg: 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/fedpkg - from package: fedpkg-minimal
/usr/bin/fedpkg - from package: fedpkg

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

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