geoiplookup: 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/geoiplookup - from package: GeoIP

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

On Debian possible default full paths are:

/usr/bin/geoiplookup - from package: geoip-bin

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

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