pius: 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/pius - from package: pius

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

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