bwctl: 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/bwctl - from package: bwctl-client

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

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