How to make sed omit not matching lines?
Use the no-print flag (-n) and explicitly print successful substitute commands (s///p):
sed -n 's/\(a\|c\)./\1/p'
How to make sed omit not matching lines?
Use the no-print flag (-n) and explicitly print successful substitute commands (s///p):
sed -n 's/\(a\|c\)./\1/p'