pvffile: 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/pvffile - from package: mgetty-voice

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

On Debian possible default full paths are:

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

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

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