pypar2: 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/bin/pypar2 - from package: pypar2

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

Error in other languages:
pypar2: bevel nie gevind nie
pypar2: comandă negăsită
pypar2: comando não encontrado
pypar2: commande introuvable
pypar2: command not found
pypar2: käsku ei ole
pypar2: không tìm thấy lệnh
pypar2: komanda nerasta
pypar2: Kommando nicht gefunden.
pypar2: kommandot finns inte
pypar2: komut yok
pypar2: nie znaleziono polecenia
pypar2: níor aimsíodh an t-ordú
pypar2: no se encontró la orden
pypar2: no s'ha trobat l'ordre
pypar2: opdracht niet gevonden
pypar2: parancs nem található
pypar2: perintah tidak ditemukan
pypar2: príkaz nenájdený
pypar2: příkaz nenalezen
pypar2: команда не найдена
pypar2: командата не е открита
pypar2: 命令找不到
pypar2: コマンドが見つかりません