SGrid: 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/SGrid - from package: vtk-examples

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

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