loon: 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/loon - from package: alliance

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

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