pvftolin: 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/pvftolin - from package: mgetty-voice

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

On Debian possible default full paths are:

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

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

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