brewtarget: 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/brewtarget - from package: brewtarget

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

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