grotty: 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/grotty - from package: groff

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

On Debian possible default full paths are:

/usr/bin/grotty - from package: groff-base

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

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