pvfamp: 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/pvfamp - from package: mgetty-voice

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

On Debian possible default full paths are:

/usr/bin/pvfamp - from package: mgetty-pvftools

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

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