Een boek doorzoeken met de shell

Er staat een kopie van Charles Dickens' beroemde 'Tale of Two Cities' in je home-directory met de naam two_cities.txt.

Gebruik commandoregelprogramma's zoals cat, grep en wc met de juiste vlag om het aantal regels in het boek te tellen dat óf het personage 'Sydney Carton' óf 'Charles Darnay' bevat. Gebruik precies deze spellingen en hoofdletters.

Deze oefening maakt deel uit van de cursus

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: Introductie en opfrisser Exercise 2: Scores extraheren met de shell Exercise 3: Een boek doorzoeken met de shell

Huidige oefening

Exercise 4: Je eerste Bash-script Exercise 5: Een eenvoudig Bash-script Exercise 6: Shell-pijplijnen naar Bash-scripts Exercise 7: Gegevens bewerken met Bash-scripts Exercise 8: Standaardstromen en argumenten Exercise 9: Argumenten gebruiken in Bash-scripts Exercise 10: Argumenten gebruiken met HR-gegevens

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: Basic variables in Bash Exercise 2: Using variables in Bash Exercise 3: Shell within a shell Exercise 4: Numeric variables in Bash Exercise 5: Converting Fahrenheit to Celsius Exercise 6: Extracting data from files Exercise 7: Arrays in Bash Exercise 8: Creating an array Exercise 9: Creating associative arrays Exercise 10: Climate calculations 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