qsub-torque: 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/bin/qsub-torque - from package: torque-client

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