tlsgatling: 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/tlsgatling - from package: gatling

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

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