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awk -F, -vOFS=, '{$4=$4 OFS}1'


Will simply add that comma into 4th field.

Few mistakes in your code:
1. Your 'for' loop does nothing! Remove the ; after for statement
2. You are writing an assignment when u say Change it to comparision.
3. Use a print


awk -F,...

You can enumerate the files into the loop and employ two background processes, one writing to out1 and the other to out2. Using the jobs command you can check whether one of them has finished and...

The first line should replace any occurrence of ' in a line with \'
While the second replaces any " with \".

Each backslash escapes it's neighbor on the right, so \\\' means to take the 2nd...