How to get no. of lines count that matches a string from all the files in a folder

Question

Problem Description:- I have a folder which contains so many text files. I want to search for a particular string say "string_example" in all files in that folder.Then I should get the count of total no. of lines in all files which has the string "string_example". That means if there are 5 matching lines in 1st text file,10 matching lines in second text file, 3 matching lines in 3rd text file.Then the output should be 5+10+3=18

What I Have tried:- I have surfed through the internet and found some commands like

• grep -r -n ".string_example" .

This bash command will print the file name along with line number of the lines which contains the string "string_example".Here is the sample output for better understanding

1st file:1:string_example is there

1st file:2:string_example is not there

2nd file:1:string_example is there

etc.......But the actaul output I want is 3 from the above output.

I have also tried few more bash commands but of no use.

My Question :- Is there any bash command for this kind of purpose.If not how to write a script for the following requirement.

Pls help me

Answer 1

您可以使用wc -l您的grep以获取包含您的关键字的行数：

grep -r "string_example" . | wc -l

Answer 2

You could also use awk to do this:

awk '/string_example/{++c}END{print c}' *

c is incremented every time a line matches the pattern. Once all files have been read, print the total count.

Answer 3

You want something like this?

grep -l string_example *|xargs wc -l

Edit:
You want to get numer of lines that matched in all files, or total numer of lines in files that contains matched line?

Answer 4

With this command given at the shell prompt you'll

% find -type f -name \*.h | xargs grep -l stdlib  | xargs wc -l | awk '{a+=$1} END{print a}'
16372
% 

1. get a list of all files, here and under, ending in .h
2. grep these files to find references to stdlib and by the option -l print only (and once) the names of the files that have at least one match
3. pass the list of names to wc -l
4. use awk to sum the count of lines for each file