string - Windows tool to count occurences of a string in a large file?

Question

I need a tool which counts occurences of a certain string in a large (~ 2GB) text file. Whats a good and fast tool?

Thanks!

Answer 1

Install Cygwin and do grep -o string file | wc -w:-)

Answer 2

Edit: Works only on text files and only when the string occur once on each line

A simple python script:

input_file  = open( source_path , encoding="utf8" , mode='r' )
for line in input_file:
    if line.find("###") >= 0:
         Counter=Counter+1

yet grep shuld do the work better.