artha: 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/artha - from package: artha

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

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