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You edit the file with a text editor. If you want to edit /etc/bash.bashrc (the file may be /etc/bashrc or something different though), you'll need to be root. Obviously if you want to edit the .bashrc in your home directory, you won't need root priviliges.
Unless for specific need, this should not been put in bashrc.
.bashrc is executed for each subshells.
So you login, /etc/profile is executed only once
You open a terminal in your wm for example, bashrc is executed
In this terminal you open an subshell (like running any script would do) :
Solution is to put it in a profile file (/etc/profile for example)
There are many editors avail on Linux.
Pls add your distribution ie Linux name eg Rh Fedora Core, Suse, Debain, whatever to your profile info (info under your name on posts).
Aslo, add your dektop environment ie KDE or Gnome (probably one of those).
anyway, some editores include:
vi, vim, kedit, gedit, kate, nano, pico etc ....
You'll need to learn at least one of those.
The editor that's avail on all Unix style systems is vi, and a lot these days have the option of vim (means vi improved).
Others may or may not be available.