upgrade.properties: 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/share/jmeter/bin/upgrade.properties - from package: jmeter

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

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