ceph-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 CentOS possible default full paths are:

/usr/bin/ceph-brag - from package: ceph-common

You may install the required package with command yum install {package}

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