rfrm: 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/rfrm - from package: dpm

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

On Debian possible default full paths are:

/usr/bin/rfrm - from package: dpm

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

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