"export" doesn't work
 

Hi,
I'm working with RedHat 8. I try to update the PATH variable, in a bash shell, as following:
PATH=$PATH:/bin/bla:/bin/kuku
export PATH
As a result, the PATH is changed only for the current window. This is problwem, because I want the PATH update to be global change.
How can I update the PATH?

Thank you.

You'd need to update your shell configuration files and relogin.

I'm new in linux.
What exactly should I do?

Well, it may depend on your distro, other details in your files, and what exactly you want to do. If you want to make this take effect for all users, something like what you typed at the command line:
PATH=$PATH:/bin/bla:/bin/kuku
export PATH
in /etc/profile or, if you just want it for yourself, putting it in ~/.bash_profile and/or ~/.bashrc.

I actually put
export PATH=/blah
all in one go, but either works.