luajit-2.0.3: 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/luajit-2.0.3 - from package: luajit

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

Error in other languages:
luajit-2.0.3: bevel nie gevind nie
luajit-2.0.3: comandă negăsită
luajit-2.0.3: comando não encontrado
luajit-2.0.3: commande introuvable
luajit-2.0.3: command not found
luajit-2.0.3: käsku ei ole
luajit-2.0.3: không tìm thấy lệnh
luajit-2.0.3: komanda nerasta
luajit-2.0.3: Kommando nicht gefunden.
luajit-2.0.3: kommandot finns inte
luajit-2.0.3: komut yok
luajit-2.0.3: nie znaleziono polecenia
luajit-2.0.3: níor aimsíodh an t-ordú
luajit-2.0.3: no se encontró la orden
luajit-2.0.3: no s'ha trobat l'ordre
luajit-2.0.3: opdracht niet gevonden
luajit-2.0.3: parancs nem található
luajit-2.0.3: perintah tidak ditemukan
luajit-2.0.3: príkaz nenájdený
luajit-2.0.3: příkaz nenalezen
luajit-2.0.3: команда не найдена
luajit-2.0.3: командата не е открита
luajit-2.0.3: 命令找不到
luajit-2.0.3: コマンドが見つかりません