Minigrep - simple grep in Rust

Prerequisites

Make sure you have Rust installed on your machine
rustc --version
cargo --version

To run a case sensitive search

From the root of this project, run
- cargo run [text to search] [file to search in]
- Ex. cargo run to poem.txt
Search results will be shown in the terminal

For case insensitive search:

Set an environment variable named CASE_INSENSITIVE to any value
- On a Mac, export CASE_INSENSITIVE=1
Unset this variable to go back to case sensitive search
- On a Mac, unset CASE_INSENSITIVE

To output the search results to a file

cargo run [text to search] [file to search in] > [file name]
Ex. cargo run to poem.txt > output.txt