ipengine: 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/ipengine - from package: python-ipython-console

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

On Debian possible default full paths are:

/usr/bin/ipengine - from package: ipython

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

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