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linux - How to remove all lines from a text file starting at first empty line?

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: ABC
2: DEF
3:
4: GHI

Line 3 and 4 should be removed and the remaining content should be saved in a new file.

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With GNU sed:

sed '/^$/Q' "input_file.txt" > "output_file.txt" 

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