pyro-es: 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/pyro-es - from package: pyro

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

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