condor_ping: 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/condor_ping - from package: condor

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

On Debian possible default full paths are:

/usr/bin/condor_ping - from package: htcondor

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

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