pbsdsh: 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/pbsdsh - from package: torque-client

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

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