jnoise: 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/jnoise - from package: jnoise

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

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