remove all lines from a text file starting at first empty line

Question

What is the best way to remove all lines from a text file starting at first empty line in Bash? External tools (awk, sed...) can be used!

Example

1:          


        

Answer 1

Perl version

 perl -e '
        open $fh, ">","stuff";  
        open $efh, ">", "rest_of_stuff"; 
        while(<>){
           if ($_ !~ /\w+/){
                 $fh=$efh;
           } 
           print $fh $_;
         }
            ' demo

This creates two output files and iterates over the demo data. When it hits a blank line, it flips the output from one file to the other.

Creates

stuff:

ABC
DEF

rest_of_stuff:

GHI