Поиск повторяющихся строк. Исходник написан на Python
import os
## Move into the directory where the database is.
os.chdir('folder where file is')
open_file = open('candidates.txt', 'r')
line = open_file.readline()
name = line.strip()
candidateDict = {}
def find_duplicate():
for name in open_file:
if candidateDict.has_key(name):
candidateDict[name] += 1
else:
candidateDict[name] = 1
find_duplicate()
for name in candidateDict:
if candidateDict[name] > 1:
print name
open_file.close()