penctl: 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/penctl - from package: pen

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

On Debian possible default full paths are:

/usr/bin/penctl - from package: pen

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

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