On an Ubuntu system with bash as the default shell for the interested user, the http_proxy environment variable is set to a specific value in a fresh GNOME Terminal.The .bashrc file for this user and the one common to all users are not setting this value. A recursive grep looking for the proxy specific value from the root file system is running, but will take hours to complete.What are the common places I can look at to know where this proxy value is set ? 
Who is setting http_proxy?
bash;ubuntu;environment variables
Is NetworkManager setting it? Assuming you're using it to manage your network connection. Also you can invoke a shell like this in debug mode so you can get some context of other things happening around the setting of this variable.Example$ bash -x+ '[' -f /etc/bashrc ']'+ . /etc/bashrc++ '[' '\s-\v\$ ' ']'++ '[' -z '' ']'++ case $TERM in++ '[' -e /etc/sysconfig/bash-prompt-xterm ']'++ '[' 3409 -ge 3405 ']'++ PROMPT_COMMAND=__vte_prompt_command++ shopt -s histappend++ history -a++ shopt -s checkwinsize++ '[' '\s-\v\$ ' = '\s-\v\$ ' ']'++ PS1='[\u@\h \W]\$ '++ shopt -q login_shell++ '[' 1000 -gt 199 ']'+++ id -gn+++ id -un++ '[' saml = saml ']'++ umask 002++ for i in '/etc/profile.d/*.sh'++ '[' -r /etc/profile.d/256term.sh ']'...