alias hello='echo Hello' - why doesn't this work after a restart?

Question

All over the internet you see this commands

alias hello='echo Hello' 

Yes, I know the above is a lame example, but it's beside the point. If I execute that, it works. But when I restart my computer, it is lost. Why? a bug with the alias command? Why would it only work until a restart is executed?

Thanks

Answer 1

You will need to write it into your ~/.bashrc like

echo "alias hello='echo hello'" >> ~/.bashrc

This appends the string to your .bashrc and will be read when you start a bash in xterm or even pure command line.