gatling-dl: 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/gatling-dl - from package: gatling

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

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