elbadmin: 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/elbadmin - from package: python2-boto
/usr/bin/elbadmin - from package: python-boto

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

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