diff --git a/Learning/minigrep/Cargo.toml b/Learning/minigrep/Cargo.toml
new file mode 100644
index 0000000000000000000000000000000000000000..0e8112816202b9a9d0cb1fd912f32e7f2efe3e52
--- /dev/null
+++ b/Learning/minigrep/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "minigrep"
+version = "0.1.0"
+authors = ["Mindaugas Sharskus <g00339629@gmit.ie>"]
+edition = "2018"
+
+[dependencies]
diff --git a/Learning/minigrep/poem.txt b/Learning/minigrep/poem.txt
new file mode 100644
index 0000000000000000000000000000000000000000..87075273137fdea2814df14af10a6e6138de5986
--- /dev/null
+++ b/Learning/minigrep/poem.txt
@@ -0,0 +1,9 @@
+I'm nobody! Who are you?
+Are you nobody, too?
+Then there's a pair of us - don't tell!
+They'd banish us, you know.
+
+How dreary to be somebody!
+How public, like a frog
+To tell your name the livelong day
+To an admiring bog!
diff --git a/Learning/minigrep/src/lib.rs b/Learning/minigrep/src/lib.rs
new file mode 100644
index 0000000000000000000000000000000000000000..3f57dee4740ffacc1bc8b3ce7057540e1eaecffb
--- /dev/null
+++ b/Learning/minigrep/src/lib.rs
@@ -0,0 +1,119 @@
+//!
+//! Mini grep from tutorial
+//! https://doc.rust-lang.org/stable/book/ch12-01-accepting-command-line-arguments.html
+//!
+
+use std::fs;
+use std::env;
+use std::error::Error;
+
+
+#[derive(Debug)]
+pub struct Config {
+    query: String,
+    filename: String,
+    case_sensitive: bool,
+}
+
+impl Config {
+    ///
+    /// Create new configuration
+    ///
+    pub fn new(args: &[String]) -> Result<Self, &'static str> {
+        if args.len() < 2 {
+            return Err("not enough arguments"); // return error if not enough arguments
+        }
+
+        Ok(Self {
+            query: args[0].clone(),
+            filename: args[1].clone(),
+            case_sensitive: env::var("CASE_INSENSITIVE").is_err(),   // check id environment variable exist
+        })
+    }
+}
+
+///
+/// Runs our mini-grep app
+///
+pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
+    let contents = fs::read_to_string(&config.filename)?;   // panics if can't open file
+
+    let results = if config.case_sensitive {
+        search_sensitive(&config.query, &contents)
+    }
+    else {
+        search_case_insensitive(&config.query, &contents)
+    };
+
+    for line in results {
+        println!("{}", line);
+    }
+
+    Ok(())
+}
+
+///
+/// Case sensitive search.
+///
+fn search_sensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
+    let mut results = Vec::new();
+
+    for line in contents.lines() {
+        if line.contains(query) {
+            results.push(line);
+        }
+    }
+
+    results
+}
+
+///
+/// Case insensitive search
+///
+fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
+    let query = query.to_lowercase();
+    let mut results = Vec::new();
+
+    for line in contents.lines() {
+        if line.to_lowercase().contains(&query) {
+            results.push(line);
+        }
+    }
+
+    results
+}
+
+
+//!
+//! Tests
+//!
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn case_sensitive() {
+        let query = "duct";
+        let contents = "\
+Rust:
+safe, fast, productive.
+Pick three.";
+
+        assert_eq!(vec!["safe, fast, productive."], search_sensitive(query, contents));
+    }
+
+    #[test]
+    fn case_insensitive() {
+        let query = "rUsT";
+        let contents = "\
+Rust:
+safe, fast, productive.
+Pick three.
+Trust me.";
+
+        assert_eq!(
+            vec!["Rust:", "Trust me."],
+            search_case_insensitive(query, contents)
+        );
+    }
+}
diff --git a/Learning/minigrep/src/main.rs b/Learning/minigrep/src/main.rs
new file mode 100644
index 0000000000000000000000000000000000000000..90e06e2ffe91b555069facf7792c7df49c4fd4cf
--- /dev/null
+++ b/Learning/minigrep/src/main.rs
@@ -0,0 +1,27 @@
+//!
+//! Mini grep from tutorial
+//! https://doc.rust-lang.org/stable/book/ch12-01-accepting-command-line-arguments.html
+//!
+//! to run it:
+//!     `cargo run <query> <file>`
+//!     `CASE_INSENSITIVE cargo run <query> <filename>`
+//!
+
+use std::{env, process};
+
+use minigrep;
+use minigrep::Config;
+
+fn main() {
+    let args: Vec<String> = env::args().skip(1).collect();
+
+    let config = Config::new(&args).unwrap_or_else(|err|{
+        eprintln!("Problem parsing arguments: {}", err);    // print to stderr
+        process::exit(1);
+    });
+
+    if let Err(e) = minigrep::run(config){
+        eprintln!("Application error: {}", e);  // print to stderr
+        process::exit(1);
+    }
+}