ipcheck.py: 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 Debian possible default full paths are:

/usr/sbin/ipcheck.py - from package: ipcheck

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

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