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Exercism

Bash

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Overview

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Bash is the language that you will learn to love! Many of your everyday computer tasks can be done using the concise scripts it can produce. You will soon learn that while most things can be done through a Graphical User Interface, it can actually be vastly faster to use this powerful language! The command interpreter typically runs in a text window, where users may input commands (operations may also come from some files, also known as Bash scripts).

Syllabus

  • Hello World
    • Exercism's classic introductory exercise. Just say "Hello, World!".
  • Reverse String
    • Reverse a given string.
  • Two Fer
    • Create a sentence of the form "One for X, one for me.".
  • Allergies
    • Given a person's allergy score, determine whether or not they're allergic to a given item, and their full list of allergies.
  • Armstrong Numbers
    • Determine if a number is an Armstrong number.
  • Difference of Squares
    • Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.
  • Error Handling
    • Implement various kinds of error handling and resource management.
  • 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'.
  • 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.
  • Line Up
    • Help lining up customers at YaÊ»qÅ«b's Deli.
  • Pangram
    • Determine if a sentence is a pangram.
  • Raindrops
    • Convert a number into its corresponding raindrop sounds - Pling, Plang and Plong.
  • Resistor Color
    • Convert a resistor band's color to its numeric representation.
  • Resistor Color Duo
    • Convert color codes, as used on resistors, to a numeric value.
  • RNA Transcription
    • Given a DNA strand, return its RNA complement.
  • Scrabble Score
    • Given a word, compute the Scrabble score for that word.
  • Secret Handshake
    • Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.
  • Series
    • Given a string of digits, output all the contiguous substrings of length `n` in that string.
  • Sublist
    • Write a function to determine if a list is a sublist of another list.
  • Acronym
    • Convert a long phrase to its acronym.
  • Anagram
    • Given a word and a list of possible anagrams, select the correct sublist.
  • Bob
    • 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.
  • Collatz Conjecture
    • Calculate the number of steps to reach 1 using the Collatz conjecture.
  • Darts
    • Calculate the points scored in a single toss of a Darts game.
  • D&D Character
    • Randomly generate Dungeons & Dragons characters.
  • 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.
  • Isogram
    • Determine if a word or phrase is an isogram.
  • Matching Brackets
    • Make sure the brackets and braces all match.
  • Nucleotide Count
    • Given a DNA string, compute how many times each nucleotide occurs in the string.
  • Perfect Numbers
    • Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers.
  • 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.
  • Proverb
    • For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.
  • 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.
  • Rotational Cipher
    • Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
  • Sieve
    • Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.
  • Space Age
    • Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.
  • Square Root
    • Given a natural radicand, return its square root.
  • 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.
  • Twelve Days
    • Output the lyrics to 'The Twelve Days of Christmas'.
  • 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.
  • Binary Search
    • Implement a binary search algorithm.
  • Diamond
    • Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.
  • Gigasecond
    • Given a moment, determine the moment that would be after a gigasecond has passed.
  • ISBN Verifier
    • Check if a given string is a valid ISBN-10 number.
  • 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.
  • Pascal's Triangle
    • Compute Pascal's triangle up to a given number of rows.
  • Pig Latin
    • Implement a program that translates from English to Pig Latin.
  • Roman Numerals
    • Convert modern Arabic numbers into Roman numerals.
  • Atbash Cipher
    • Create an implementation of the Atbash cipher, an ancient encryption system created in the Middle East.
  • Crypto Square
    • Implement the classic method for composing secret messages called a square code.
  • Diffie-Hellman
    • Diffie-Hellman key exchange.
  • Flower Field
    • Mark all the flowers in a garden.
  • Food Chain
    • Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'.
  • Grep
    • Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.
  • Rational Numbers
    • Implement rational numbers.
  • Robot Simulator
    • Write a robot simulator.
  • Run-Length Encoding
    • Implement run-length encoding and decoding.
  • Say
    • Given a number from 0 to 999,999,999,999, spell out that number in English.
  • Simple Cipher
    • Implement the Vigenère cipher, a simple substitution cipher.
  • Tournament
    • Tally the results of a small football competition.
  • Transpose
    • Take input text and output it transposed.
  • Affine Cipher
    • Create an implementation of the Affine cipher, an ancient encryption algorithm from the Middle East.
  • Bowling
    • Score a bowling game.
  • Meetup
    • Calculate the date of meetups.
  • Nth Prime
    • Given a number n, determine what the nth prime is.
  • OCR Numbers
    • Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.
  • Palindrome Products
    • Detect palindrome products in a given range.
  • Pythagorean Triplet
    • Given an integer N, find all Pythagorean triplets for which a + b + c = N.
  • Spiral Matrix
    • Given the size, return a square matrix of numbers in spiral order.
  • 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.
  • Forth
    • Implement an evaluator for a very simple subset of Forth.
  • List Ops
    • Implement basic list operations.
  • Markdown
    • Refactor a Markdown parser.
  • Satellite
    • Rebuild binary trees from pre-order and in-order traversals.
  • Variable Length Quantity
    • Implement variable length quantity encoding and decoding.
  • 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.
  • Poker
    • Pick the best hand(s) from a list of poker hands.
  • Rail Fence Cipher
    • Implement encoding and decoding for the rail fence cipher.
  • 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.

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