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

-n returns line number.

-i is for ignore-case. Only to be used if case matching is not necessary

$ grep -in null myfile.txt

2:example two null,
4:example four null,

Combine with awk to print out the line number after the match:

$ grep -in null myfile.txt | awk -F: '{print $2" - Line number : "$1}'

example two null, - Line number : 2
example four null, - Line number : 4

Use command substitution to print out the total null count:

$ echo "Total null count :" $(grep -ic null myfile.txt)

Total null count : 2