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I have a comma seperated csv file as a sample like:

1,92345,92345,Dear user, this is your amount , 2016-10-10 
2,92345,92345,Dear user, this is your amount , 2016-10-09

I need to replace 4th comma , only after the Dear user with a pipeline |.

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Using sed, you can specifically tell sed which occurrences of pattern only you want to replace, so:

sed 's/,/|/4' infile

Or with different solution would be:

sed -r 's/^([^,]*,)([^,]*,)([^,]*,)([^,]*),(.*)/\1\2\3\4|\5/' infile

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