How can I format my grep output to show line numbers at the end of the line, and also the hit count?

Question

I\'m using grep to match string in a file. Here is an example file:

example one,
example two null,
example three,
example four null,

grep

Answer 1

or in perl (for completeness...):

perl -npe 'chomp; /null/ and print "$_ - Line number : $.\n" and $i++;$_="";END{print "Total null count : $i\n"}'