BASH from beginner to advanced: Solutions to Hackerrank Challenges - Episode 16: Head and Tail
Welcome to this comprehensive series of videos where we will be giving solutions and explanations for various BASH challenges from Hackerrank. In this video, we will be addressing 5 tasks, including "Head of a Text File #1" (https://www.hackerrank.com/challenges..., "Head of a Text File #2" (https://www.hackerrank.com/challenges..., "Tail of a Text File #1" (https://www.hackerrank.com/challenges..., "Display the Third Element Tail of a Text File #2 (https://www.hackerrank.com/challenges..., and "Middle of a Text File" (https://www.hackerrank.com/challenges....
Our goal in this series is to document my thought process and solutions, and to focus on concepts and ideas rather than details. I will also be highlighting the differences between BASH and popular programming languages like Python and JavaScript.
BASH is a powerful command-line interface for interacting with an operating system. It's a shell, and the most popular one. It can be used directly in the terminal or in scripts, which are text files containing a series of instructions. BASH is particularly useful for tasks such as text processing, file operations, connecting multiple programs, and system maintenance. It is also portable, working by default on many platforms.
The head command displays the first n lines of a text file or standard input, where n is a number specified by the user (by default, n is 10). For example, to display the first 20 lines of a file named example.txt, you would use the command:
head -n 20 example.txt
The tail command, on the other hand, displays the last n lines of a text file or standard input. By default, tail displays the last 10 lines of the file, but the user can specify a different number using the -n option. For example, to display the last 20 lines of a file named example.txt, you would use the command:
tail -n 20 example.txt
Both head and tail commands can be useful for quickly previewing the contents of a file or for displaying the latest entries in a log file, for example. Additionally, they can be used together with other Unix commands in a pipeline to perform more complex operations on text data.
If you want to see all the solutions for these challenges, you can find them on my Github repository: https://github.com/djeada/Bash-Hacker...
Also, you can find me on my website: https://adamdjellouli.com/ where I write about different programming topics, and you can see my other projects.
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