qschedd: 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
/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/sbin/qschedd - from package: torque-scheduler

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