jnoisemeter: 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/jnoisemeter - from package: jnoisemeter

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

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