lwp-rget: 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/lwp-rget - from package: perl-libwww-perl

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

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