rfcp: 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/rfcp - from package: dpm

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

On Debian possible default full paths are:

/usr/bin/rfcp - from package: dpm

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

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