title: How to use `awk` so that i can alter only one or two fields in the line conditionally?
body: <p>I have a tab separated file with 16 fields.  Can i use <code>awk</code> to conditionally alter one one or fields and print the whole line as the output? e.g., depending on value in the first field, i want to say add a specific number to field 4 and so on. But as a output i have to print the whole line. If yes, i would like to know how. </p>