fcoemon: 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/sbin/fcoemon - from package: fcoe-utils

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

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