qping: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/qping - from package: gridengine
/usr/share/gridengine/bin/lx26-amd64/qping - from package: gridengine
/usr/share/gridengine/bin/lx26-x86/qping - from package: gridengine

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