dup3

Documentation

Overview

Dup3 prints the count and text of lines that appear more than once in the named input files. It reads in entire file at once ("slurp" mode). Adapted from github.com/adonovan/gopl.io/tree/master/ch1/dup3.

os.ReadFile (dup3) and bufio.Scanner (dup2) use the Read and Write methods of *os.File under covers.

Level: beginner Topics: io, maps, os.ReadFile, strings.Split