pbs_track: 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_track - from package: torque-mom

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

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