gxeps: 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/gxeps - from package: grads

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

On Debian possible default full paths are:

/usr/bin/gxeps - from package: grads

You may install the required package with command apt-get install {package}

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