graver: 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/graver - from package: 4ti2

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

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