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  1. #!/bin/bash
  2. awk -F '"' 'BEGIN { OFS=FS }
  3. { for(i=2; i<=NF; i+=2)
  4. gsub(/,/, "", $i) }1'
Success #stdin #stdout 0.01s 5300KB
stdin
1,2,3,"test1,test2,test3",4,5,6
stdout
1,2,3,"test1test2test3",4,5,6