prt: 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/prt - from package: prt

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

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