rfcat: 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/rfcat - from package: dpm

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

On Debian possible default full paths are:

/usr/bin/rfcat - from package: dpm

You may install the required package with command apt-get install {package}

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