Gegevens uit bestanden halen

Je bent data scientist bij een onderzoeksorganisatie voor klimaat. Om een paar modellen bij te werken, moet je temperatuurdata halen voor 3 regio’s die je in de gaten houdt. Helaas zijn de temperatuursensoren vrij oud en kunnen ze alleen zo worden ingesteld dat ze elke dag data wegschrijven in een map temps op je server. Elk bestand bevat de dagtemperatuur voor elke regio.

Jouw taak is om de data uit elk bestand te halen (door te concatenaten) in de bijbehorende variabele en deze af te drukken. De temperatuur in het bestand region_A moet worden toegewezen aan de variabele temp_a, enzovoort.

Later ga je meer geavanceerde berekeningen uitvoeren op deze variabelen.

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Introductie tot Bash-scripting

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Introductie tot Bash-scripting

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Save yourself time when performing complex repetitive tasks. You’ll begin this course by refreshing your knowledge of common command-line programs and arguments before quickly moving into the world of Bash scripting. You’ll create simple command-line pipelines and then transform these into Bash scripts. You’ll then boost your skills and learn about standard streams and feeding arguments to your Bash scripts.

Exercise 1: Introduction and refresher Exercise 2: Extracting scores with shell Exercise 3: Searching a book with shell Exercise 4: Your first Bash script Exercise 5: A simple Bash script Exercise 6: Shell pipelines to Bash scripts Exercise 7: Extract and edit using Bash scripts Exercise 8: Standard streams & arguments Exercise 9: Using arguments in Bash scripts Exercise 10: Using arguments with HR data

Master the bread and butter of Bash scripts—variables! In this chapter, you’ll learn how to create basic string and numeric variables, and perform calculations on these variables. You’ll also learn about the magic of a shell-within-a-shell (shell-ception), opening up huge opportunities for advanced scripting.

Exercise 1: Basisvariabelen in Bash Exercise 2: Variabelen gebruiken in Bash Exercise 3: Shell in een shell Exercise 4: Numerieke variabelen in Bash Exercise 5: Fahrenheit omzetten naar Celsius Exercise 6: Gegevens uit bestanden halen

Huidige oefening

Exercise 7: Arrays in Bash Exercise 8: Een array maken Exercise 9: Associatieve arrays maken Exercise 10: Klimaatberekeningen in Bash

Life isn't always linear and neither should your Bash scripts. In this chapter, you’ll take your Bash scripts to the next level by learning control statements. You’ll learn the differences between FOR, WHILE, IF, and CASE statements and how to use them in your Bash scripts. Armed with these new tools, you’ll be ready to create more advanced Bash scripts with conditional logic.

Exercise 1: IF statements Exercise 2: Sorting model results Exercise 3: Moving relevant files Exercise 4: FOR loops & WHILE statements Exercise 5: A simple FOR loop Exercise 6: Correcting a WHILE statement Exercise 7: Cleaning up a directory Exercise 8: CASE statements Exercise 9: Days of the week with CASE Exercise 10: Moving model results with CASE Exercise 11: Finishing a CASE statement

Give your Bash scripts a powerful new addition by building useful functions to process data and variables. In this last chapter, you will learn the structure of functions in Bash, how to use functions to help automate frequent tasks, and program your scripts to run on schedule without needing to even lift a finger.

Exercise 1: Basic functions in Bash Exercise 2: Uploading model results to the cloud Exercise 3: Get the current day Exercise 4: Arguments, return values, and scope Exercise 5: A percentage calculator Exercise 6: Sports analytics function Exercise 7: Summing an array Exercise 8: Scheduling your scripts with Cron Exercise 9: Analyzing a crontab schedule Exercise 10: Creating cronjobs Exercise 11: Scheduling cronjobs with crontab Exercise 12: Thanks and wrap up