brag: 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/brag - from package: brag

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

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