This simple CLI tool searches for a given pattern in a specified file and as a result, it prints all the lines that contain the pattern.

This program is a simple implementation of the grep command-line tool in Rust. It is an exercise present in the Rust Programming Language book. It includes an extra feature of searching for a pattern in multiple files, which is not present in the original exercise. This feature was added to practice mutli-threading in Rust.

Working through the exercise, the developer gets introduced to handling command-line arguments, reading files, error handling, and other concepts in Rust.

The requirement for running/building this program is having the Rust Programming language instaled. Learn how to get started on the official website.

After cloning this repository, navigate to the project's root directory and run the following command:

$ cargo run <pattern> <file path | multiple paths>

Where <pattern> is the pattern you want to search for and <file> is a file path for the file you want to search the contents of.

$ cargo run to _poem.txt

Are you nobody, too?
How dreary to be somebody!

$ cargo run to _poem.txt _funny.txt _serious.txt

[_poem.txt]:
Are you nobody, too?
How dreary to be somebody!

[_funny.txt]:
Lived a man with too many felines.
Remember this whimsical town.

[_serious.txt]:
A journey embarked, yet often untold.
Echoing stories only time can tell.
Love's gentle touch, a soothing balm,

To perform a case-insensitive search, set the IGNORE_CASE environment variable to any value.

$ IGNORE_CASE=1 cargo run to _poem.txt

Are you nobody, too?
How dreary to be somebody!
To tell your name the livelong day
To an admiring bog!