pof1: 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 Debian possible default full paths are:

/usr/share/doc/mh-book/examples/mh/bin/pof1 - from package: mh-book

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

Error in other languages:
pof1: bevel nie gevind nie
pof1: comandă negăsită
pof1: comando não encontrado
pof1: commande introuvable
pof1: command not found
pof1: käsku ei ole
pof1: không tìm thấy lệnh
pof1: komanda nerasta
pof1: Kommando nicht gefunden.
pof1: kommandot finns inte
pof1: komut yok
pof1: nie znaleziono polecenia
pof1: níor aimsíodh an t-ordú
pof1: no se encontró la orden
pof1: no s'ha trobat l'ordre
pof1: opdracht niet gevonden
pof1: parancs nem található
pof1: perintah tidak ditemukan
pof1: príkaz nenájdený
pof1: příkaz nenalezen
pof1: команда не найдена
pof1: командата не е открита
pof1: 命令找不到
pof1: コマンドが見つかりません