sed + remove “#” and empty lines with one sed command

Question

how to remove comment lines (as # bal bla ) and empty lines (lines without charecters) from file with one sed command?

THX lidia

Answer 1

First example(paxdiablo) is very good except its not change file, just output result. If you want to change it inline:

sudo sed -i 's/#.*$//;/^$/d' inputFile