rfchmod: 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/rfchmod - from package: dpm

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

On Debian possible default full paths are:

/usr/bin/rfchmod - from package: dpm

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

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