fcnsq: 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/fcnsq - from package: fcoe-utils

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

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