radosgw: 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/radosgw - from package: ceph-radosgw

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

On Debian possible default full paths are:

/usr/bin/radosgw - from package: radosgw

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

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