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#!/bin/bash
X="alpha
beta
gamma"
 
awk -v var="$X" '/tag/ && !p {
    print; print var; p=1; next}
  /tag/ {p=0} !p'

Success #stdin #stdout 0.01s 5284KB

stdin

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bla
bla
bla
tag
text 1
text 2
tag
bla
bla

stdout

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bla
bla
bla
tag
alpha
beta
gamma
tag
bla
bla

https://ideone.com/pFvU1B

https://stackoverflow.com/questions/78479826/awk-command-to-replace-block-between-two-tags-with-contents-of-variable

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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