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#!/bin/bash
sed ':0
/^\([^"]*,"[^,"]*\),/{
  s//\1/
  b0
}'

Success #stdin #stdout 0.01s 5312KB

stdin

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1,2,3,"test1,test2,test3",4,5,6

stdout

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1,2,3,"test1test2test3",4,5,6

https://ideone.com/VFnkNs

https://stackoverflow.com/questions/77604059/remove-commas-within-double-quoted-strings-with-sed

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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