roarsin: 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/roarsin - from package: roarclients

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

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