fawkes: 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/fawkes - from package: fawkes-core

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

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