How to add a tab to awk '{print}'?

Question

linux

I'm looking for a pattern in a file, I need a tab or a space on the output to the line, I tried to add FS, OFS, maybe I made a mistake somewhere with the syntax.
How can I do if I use awk?
cat txt.txt | awk '/'$p'/{print}'

Answer 1

You have a strange pattern: $p -- p after the end of the line. It doesn't match for me (:
You can use printf, formatting is like in C:
A book about awk: www.gnu.org/software/gawk/manual/gawk.html