qgpumode: 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/qgpumode - from package: torque-client

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

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