AWK

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awk is an interpreted programming language designed for text processing and typically used as a data extraction and reporting tool. It is a standard feature of most Unix-like operating systems, and has a POSIX specification. An awk programming paradigm can be said to be "data driven": an awk program reads lines (or other units of text), and looks for matches of . When a match occurs, the specified is performed.

Syllabus

Hello World

Exercism's classic introductory exercise. Just say "Hello, World!".

Basics

Introduction to fundamental AWK concepts

Simple Report

Generate a simple report from an input CSV file.

Vehicle Purchase

Learn about AWK patterns while preparing for your next vehicle purchase.

Two Fer

Create a sentence of the form "One for X, one for me.".

Acronym

Convert a long phrase to its acronym.

Allergies

Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.

Collatz Conjecture

Calculate the number of steps to reach 1 using the Collatz conjecture.

Difference of Squares

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.

Change the data format for scoring a game to more easily add other languages.

Grains

Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.

Hamming

Calculate the Hamming distance between two DNA strands.

House

Output the nursery rhyme 'This is the House that Jack Built'.

Isogram

Determine if a word or phrase is an isogram.

Line Up

Help lining up customers at Yaʻqūb's Deli.

Largest Series Product

Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.

Leap

Determine whether a given year is a leap year.

Pangram

Determine if a sentence is a pangram.

Proverb

For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.

Raindrops

Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.

Resistor Color Duo

Convert color codes, as used on resistors, to a numeric value.

Reverse String

Reverse a given string.

RNA Transcription

Given a DNA strand, return its RNA complement.

Scrabble Score

Given a word, compute the Scrabble score for that word.

Series

Given a string of digits, output all the contiguous substrings of length `n` in that string.

Armstrong Numbers

Determine if a number is an Armstrong number.

Beer Song

Produce the lyrics to that beloved classic, that field-trip favorite: 99 Bottles of Beer on the Wall.

Binary Search

Implement a binary search algorithm.

Bob is a lackadaisical teenager. In conversation, his responses are very limited.

Bottle Song

Produce the lyrics to the popular children's repetitive song: Ten Green Bottles.

Clock

Implement a clock that handles times without dates.

Darts

Calculate the points scored in a single toss of a Darts game.

Eliud's Eggs

Help Eliud count the number of eggs in her chicken coop by counting the number of 1 bits in a binary representation.

Food Chain

Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.

Gigasecond

Given a moment, determine the moment that would be after a gigasecond has passed.

Grade School

Given students' names along with the grade that they are in, create a roster for the school.

High Scores

Manage a player's High Score list.

ISBN Verifier

Check if a given string is a valid ISBN-10 number.

Matching Brackets

Make sure the brackets and braces all match.

Pascal's Triangle

Compute Pascal's triangle up to a given number of rows.

Phone Number

Clean up user-entered phone numbers so that they can be sent SMS messages.

Prime Factors

Compute the prime factors of a given natural number.

Protein Translation

Translate RNA sequences into proteins.

Queen Attack

Given the position of two queens on a chess board, indicate whether or not they are positioned so that they can attack each other.

Resistor Color Trio

Convert color codes, as used on resistors, to a human-readable label.

Robot Simulator

Write a robot simulator.

Rotational Cipher

Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.

Secret Handshake

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.

Space Age

Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.

Sum of Multiples

Given a number, find the sum of all the multiples of particular numbers up to but not including that number.

Triangle

Determine if a triangle is equilateral, isosceles, or scalene.

Word Count

Given a phrase, count the occurrences of each word in that phrase.

All Your Base

Convert a number, represented as a sequence of digits in one base, to any other base.

Anagram

Given a word and a list of possible anagrams, select the correct sublist.

Automated readability index

Calculate the automated readability index for the text.

Book Store

To try and encourage more sales of different books from a popular 5 book series, a bookshop has decided to offer discounts of multiple-book purchases.

Diamond

Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.

Flower Field

Mark all the flowers in a garden.

Killer Sudoku Helper

Write a tool that makes it easier to solve Killer Sudokus

Kindergarten Garden

Given a diagram, determine which plants each child in the kindergarten class is responsible for.

Luhn

Given a number determine whether or not it is valid per the Luhn formula.

Pig Latin

Implement a program that translates from English to Pig Latin.

Prism

Calculate the path of a laser through refractive prisms.

Roman Numerals

Convert modern Arabic numbers into Roman numerals.

Saddle Points

Detect saddle points in a matrix.

Wordy

Parse and evaluate simple math word problems returning the answer as an integer.

Yacht

Score a single throw of dice in the game Yacht.

Atbash Cipher

Create an implementation of the Atbash cipher, an ancient encryption system created in the Middle East.

Bowling

Score a bowling game.

Crypto Square

Implement the classic method for composing secret messages called a square code.

Matrix

Given a string representing a matrix of numbers, return the rows and columns of that matrix.

Meetup

Calculate the date of meetups.

OCR Numbers

Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.

Run-Length Encoding

Implement run-length encoding and decoding.

Given a number from 0 to 999,999,999,999, spell out that number in English.

Sieve

Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.

Simple Cipher

Implement the Vigenère cipher, a simple substitution cipher.

Spiral Matrix

Given the size, return a square matrix of numbers in spiral order.

Tournament

Tally the results of a small football competition.

Affine Cipher

Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.

Forth

Implement an evaluator for a very simple subset of Forth.

Grep

Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.

Nth Prime

Given a number n, determine what the nth prime is.

Pythagorean Triplet

Given an integer N, find all Pythagorean triplets for which a + b + c = N.

Rectangles

Count the rectangles in an ASCII diagram.

Two Bucket

Given two buckets of different size, demonstrate how to measure an exact number of liters.

Variable Length Quantity

Implement variable length quantity encoding and decoding.

Poker

Pick the best hand(s) from a list of poker hands.

Change

Correctly determine change to be given using the least number of coins.

Knapsack

Given a knapsack that can only carry a certain weight, determine which items to put in the knapsack in order to maximize their combined value.

List Ops

Implement basic list operations.

Mazy Mice

Meet Mickey and Minerva, two clever mice who love to navigate their way through a maze to find cheese. They enjoy a good challenge, but with only their tiny mouse brains, they prefer if there is only one correct path to the cheese.