source ~/.bashrc
Basically this command will update and open the bash file in the same terminal page, But writing this sucks!
Instead,
Type: nano ~/.bashrc
And at the end type: alias reopen='source ~/.bashrc'. After typing this, press Ctrl+O, Enter, and Ctrl+x respectively. Then type source ~/.bashrc. And you are good to go.
Now, Typing reopen will update and reopen it on the same page. cool!
Bonus;
You can also add something like this to directly open it up from the terminal, which looks great!