sfcapd: 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/sfcapd - from package: nfdump

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

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