How to start a shell without any user configuration?

Question

I need to use a \"clean\" shell (e.g. bash) under Linux/OSX terminal without any user configuration, but it reads config info from some files (e.g ~/.bashrc) every time it s

Answer 1

Use --noprofile --norc:

   --noprofile
          Do  not  read either the system-wide startup file /etc/profile or any of the personal initializa‐
          tion files ~/.bash_profile, ~/.bash_login, or ~/.profile.  By default,  bash  reads  these  files
          when it is invoked as a login shell (see INVOCATION below).

   --norc Do  not  read  and  execute the system wide initialization file /etc/bash.bashrc and the personal
          initialization file ~/.bashrc if the shell is interactive.  This option is on by default  if  the
          shell is invoked as sh.

(from the manpage).