mrpt-performance: 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/mrpt-performance - from package: mrpt-apps

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

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