rabbitmqctl: 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/lib/rabbitmq/bin/rabbitmqctl - from package: rabbitmq-server
/usr/lib/rabbitmq/lib/rabbitmq_server-3.1.5/sbin/rabbitmqctl - from package: rabbitmq-server
/usr/sbin/rabbitmqctl - from package: rabbitmq-server

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

On Debian possible default full paths are:

/usr/lib/rabbitmq/bin/rabbitmqctl - from package: rabbitmq-server
/usr/sbin/rabbitmqctl - from package: rabbitmq-server
/usr/lib/rabbitmq/lib/rabbitmq_server-3.3.5/sbin/rabbitmqctl - from package: rabbitmq-server

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

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