pvftoau: 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/pvftoau - from package: mgetty-voice

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

On Debian possible default full paths are:

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

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

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