pingAll.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 CentOS possible default full paths are:

/usr/bin/pingAll.py - from package: cjdns-python

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

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