pithos: 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/pithos - from package: pithos

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

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