grolj4: 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/grolj4 - from package: groff

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

On Debian possible default full paths are:

/usr/bin/grolj4 - from package: groff

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

Error in other languages:
grolj4: bevel nie gevind nie
grolj4: comandă negăsită
grolj4: comando não encontrado
grolj4: commande introuvable
grolj4: command not found
grolj4: käsku ei ole
grolj4: không tìm thấy lệnh
grolj4: komanda nerasta
grolj4: Kommando nicht gefunden.
grolj4: kommandot finns inte
grolj4: komut yok
grolj4: nie znaleziono polecenia
grolj4: níor aimsíodh an t-ordú
grolj4: no se encontró la orden
grolj4: no s'ha trobat l'ordre
grolj4: opdracht niet gevonden
grolj4: parancs nem található
grolj4: perintah tidak ditemukan
grolj4: príkaz nenájdený
grolj4: příkaz nenalezen
grolj4: команда не найдена
grolj4: командата не е открита
grolj4: 命令找不到
grolj4: コマンドが見つかりません