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VIM - Reload .vimrc file without restarting vim

:so %

NOTE:

%: Stands for the current file name.
- See :h current-file.
:so: is short for :source, which reads the content of the specified file and treats it as Vim code.

Another method

Reload vimrc:

:source $MYVIMRC

Display the current vimrc:

:echo $MYVIMRC

returns:

home/peter/.vimrc