[PYTHON] Count specific strings in a file

How many specific strings are included in a certain file on Linux

Situation example



When you want to know the number of "hoge" from a file like this. (By the way, 8)

I tried to find out the number of occurrences with the built-in command, but it didn't work, so I wrote a script in Python. (Because grep may not be able to handle multiple occurrences in one line)

A script that calculates the number of specific strings


# -*- coding: utf-8 -*-
#!/usr/bin/env python
import sys
import os.path
def clean_args(args):
    if len(args) == 2:
        search_word = args[1] 
        return (True, None, search_word)
    if len(args) != 3: 
        print "[Usage] match_count.py $filename $search_word"
        return (False, None, None)
    target_file_path = args[1]
    search_word       = args[2] 
    if not os.path.exists(target_file_path):
        print "[Error] File is not exist."
        return (False, None, None)
    return (True, target_file_path, search_word)
def count_words(filename, search_word):
    if filename is not None:
        # python 2.Because it was 4, I can't use with
        stream = open(filename, 'r')
        counter = _count(stream, search_word)
        return counter
    else :
        return _count(sys.stdin, search_word)
def _count(stream, search_word):
    counter = 0
    for line in stream:
        counter += line.count(search_word)
    return counter
def main():
    args = sys.argv
    (is_valid, filename, search_word) = clean_args(args)
    if not is_valid:
    print count_words(filename, search_word)
if __name__ == '__main__':

Create this file on Linux and give it execute permission.

How to use

$ ./match_count.py hoge.txt hoge

You can get the number that matches hoge like this.

I also tried to support pipes

$ cat hoge.txt | ./match_count.py hoge

You can use it even if you like. I wonder if it will be better if I cat multiple files.

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