urlgrabber: 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/urlgrabber - from package: python-urlgrabber

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

On Debian possible default full paths are:

/usr/bin/urlgrabber - from package: python-urlgrabber

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

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