fcping: 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/fcping - from package: fcoe-utils

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

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