bash set HTTP_PROXY

 Set Linux/FreeBSD/NetBSD/OpenBSD environment HTTP_PROXY & HTTPS_PROXY variable in bash:

   export http_proxy=http://10.0.0.54:5127/

OR below line if username/password authorization is needed:

   export  http_proxy=http://USERNAME:PASSWORD@proxy.myname.com:3128/ 

   export https_proxy=$http_proxy
   export ftp_proxy=$http_proxy
   export rsync_proxy=$http_proxy
   export no_proxy="localhost,127.0.0.1,localaddress,.localdomain.com"

for compatibility reasons, below lines can be used too:

   export HTTP_PROXY=$http_proxy 
   export HTTPS_PROXY=$http_proxy

   export FTP_PROXY=$http_proxy 

   export NO_PROXY=$no_proxy

 Additionally, above lines can be added to ~/.bashrc for persistent settings.

Test the implementation using  wget http://www.synapse.ro

Never the less, in order to keep HTTP_proxy variables to sudo shell, add next line to sudo configuration file (/etc/sudoers):

Defaults env_keep += "http_proxy https_proxy ftp_proxy no_proxy rsync_proxy"