grodvi: 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/grodvi - from package: groff

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

On Debian possible default full paths are:

/usr/bin/grodvi - from package: groff

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

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