cfv: 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/cfv - from package: cfv

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

On Debian possible default full paths are:

/usr/bin/cfv - from package: cfv

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

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