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

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

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