asmon: command not found

Have You tried accessing the binary with the full path?

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/asmon - from package: asmon

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