grinder: 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/grinder - from package: grinder

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

On Debian possible default full paths are:

/usr/bin/grinder - from package: grinder

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

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