pbs-config: 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/pbs-config - from package: torque-devel

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

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