pyversions: 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/pyversions - from package: python-minimal

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

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