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 use awk instead:

awk '/null/ { counter++; printf("%s%s%i\n",$0, " - Line number: ", NR)} END {print "Total null count: " counter}' file