prg2lout: 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 CentOS possible default full paths are:

/usr/bin/prg2lout - from package: lout

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/prg2lout - from package: lout

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

Error in other languages:
prg2lout: bevel nie gevind nie
prg2lout: comandă negăsită
prg2lout: comando não encontrado
prg2lout: commande introuvable
prg2lout: command not found
prg2lout: käsku ei ole
prg2lout: không tìm thấy lệnh
prg2lout: komanda nerasta
prg2lout: Kommando nicht gefunden.
prg2lout: kommandot finns inte
prg2lout: komut yok
prg2lout: nie znaleziono polecenia
prg2lout: níor aimsíodh an t-ordú
prg2lout: no se encontró la orden
prg2lout: no s'ha trobat l'ordre
prg2lout: opdracht niet gevonden
prg2lout: parancs nem található
prg2lout: perintah tidak ditemukan
prg2lout: príkaz nenájdený
prg2lout: příkaz nenalezen
prg2lout: команда не найдена
prg2lout: командата не е открита
prg2lout: 命令找不到
prg2lout: コマンドが見つかりません