remove duplicate line from file code example

Example 1: bash remove duplicate lines from a file

# Basic syntax:
sort input_file | uniq --unique
# Sort the file first because uniq requires a sorted file to work. Uniq
# then eliminates all duplicated lines in the file, keeping one instance
# of each duplicated line

# Note, this doesn't return only non-duplicated lines. It returns
# unique instances of all lines, whether or not they are duplicated

# Note, if you want to return only one instance of all lines but see
# the number of repetitions for each line, run:
sort input_file | uniq -c

Example 2: python delete duplicate lines in file

with open("file.txt", "r") as txt_file:
  new_data = list(set(txt_file))
  return new_data