An I/O Project: Building a Command Line Program

Clone grep form The Rust Programming Language book, chapter 12.

How use?

This tool works only for utf-8 contents.

Case sensitive search

cargo run to poem.txt

Case insensitive search

For case insensitive search you need to set environment variable CASE_INSENSITIVE to any value.

CASE_INSENSITIVE=1 cargo run to poem.txt