vadmin@ubu1004:~$ sudo bash
root@ubu1004:~# export HTTP_PROXY=http://myproxy:8080
root@ubu1004:~# echo $HTTP_PROXY
http://myproxy:8080
root@ubu1004:~# sudo echo $HTTP_PROXY
http://myproxy:8080
root@ubu1004:~# perl -wle 'print $ENV{HTTP_PROXY}'
http://myproxy:8080
root@ubu1004:~# sudo perl -wle 'print $ENV{HTTP_PROXY}'
Use of uninitialized value in print at -e line 1.