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#!/bin/bash
text=$(echo -e '###\nA\nB\nC\n@@@\n###\nD\nE\nF\n@@@\n###\nG\nH\nI\n@@@')
sed '/###/{:a;N;/@@@/!ba;/A/d}' <<< "$text"

Success #stdin #stdout 0.01s 5424KB

stdin

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Standard input is empty

stdout

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###
D
E
F
@@@
###
G
H
I
@@@

https://ideone.com/Rg5ukK

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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