groebner: 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/lib64/4ti2/bin/groebner - from package: 4ti2

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

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