batctl: 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/sbin/batctl - from package: batctl

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

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