ipgrab: 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 Debian possible default full paths are:

/usr/sbin/ipgrab - from package: ipgrab

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

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