osbs: 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/osbs - from package: osbs-client
/usr/bin/osbs - from package: osbs

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

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