ipcontroller: 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/ipcontroller - 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/ipcontroller - from package: ipython

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

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