poundctl: 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/sbin/poundctl - from package: Pound

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

On Debian possible default full paths are:

/usr/sbin/poundctl - from package: Pound

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

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