fedmsg-hub: 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/fedmsg-hub - from package: fedmsg-hub

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

On Debian possible default full paths are:

/usr/bin/fedmsg-hub - from package: fedmsg-hub

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

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